Hi @Simon Müller REGA  The option to select Software or OpenGL appears based on the device configuration. OpenGL would only appear if a supported GPU driver is available on the device. Can you please check if the impacted PCs/Notebooks have GPU? If yes, please share the details of the GPU driver. ... View more

Hi @Alamout72 @BNoltner @alexsmedile @its15426586 @defaultxgidf7k7pbyo  Sorry for trouble you are facing. Could you please provide the crash stack? Refer https://helpx.adobe.com/in/acrobat/kb/collect-logs-crash-freeze.html for instructions on how to collect that. Please also provide the Acrobat and MacOS version you are using.   Also, Acrobat has already added native Apple silicon support with Sept 2021 release of Acrobat. We are rolling it out to end users in a phased manner. You could try enabling native mode as well if it fixes the issue. Refer https://helpx.adobe.com/acrobat/kb/apple-silicon-m1-processor-support.html for instruction on how to enable native mode. Thanks, Ankit Adobe Acrobat Software Developer ... View more

@broxapltd Can you please try the workarounds suggested here and let me know if that works?https://community.adobe.com/t5/acrobat-discussions/pdf-previewer-not-working-in-outlook/m-p/12431881#M332203    Also posting summarized version of the workaround: You can download the .reg file shared below and double click on it and registry entries would be automatically created. https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:e94a84df-fa43-4b26-99bf-c1906c783c2b    Please note that running .reg files changes the system configuration, so please ensure to verify the source and content of the file before running it on your system. Thanks, Ankit  Adobe Acrobat software engineer   ... View more

Yes, if you are only facing this PDF Preview issue, then registry workaround would work for all windows version. Also, this registry is being added to Acrobat installer so that in the next release of Acrobat, users won't have to manually create these keys. No, you don't have to unistall 64bit Acrobat, it would work.   ... View more

@ND95  Its publicly available here  https://community.adobe.com/t5/acrobat-reader-discussions/how-can-i-make-32-bit-reader-update-to-only-32-bit-not-64-bit/m-p/12406365#M83680    Also posting summarized version of the workaround: You can download the .reg file shared below and double click on it and registry entries would be automatically created. https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:e94a84df-fa43-4b26-99bf-c1906c783c2b    Please note that running .reg files changes the system configuration, so please ensure to verify the source and content of the file before running it on your system. Thanks, Ankit  Adobe Acrobat software engineer   Likes   ... View more

@defaultsoi0dyw0nxxf  could you please share the test file with us for more investigations?  Thanks, Ankit  Adobe Acrobat Software Engineer ... View more

@ defaulte9gk3z371vaz @garyh89129184   The info to revert back to old version is publicly posted here:  https://community.adobe.com/t5/acrobat-discussions/install-the-previous-patch-update/m-p/12402340#M330592   ... View more

Thanks for confirming @DrBob. Yes, this would be integrated with the next quarterly update of Acrobat/Reader and users won't have to run this file manually.   ... View more

  If you are facing outlook pdf preview issue. Followings are the registry entried which needs to created: [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}] "DisplayName"="@C:\\Program Files\\Adobe\\Acrobat DC\\Acrobat\\pdfprevhndlr.dll,-101" "AppID"="{6d2b5079-2f0b-48dd-ab7f-97cec514d30b}" @="Adobe PDF Preview Handler for Vista" "DisableLowILProcessIsolation"=dword:00000000 [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}\InprocServer32] "ThreadingModel"="Apartment" @="C:\\Program Files\\Adobe\\Acrobat DC\\Acrobat\\pdfprevhndlr.dll" [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}\ProgID] @="PDFPrevHndlr.PDFPreviewHandler.1" [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}\TypeLib] @="{0F6D3808-7974-4B1A-94C2-3200767EACE8}" [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}\VersionIndependentProgID] @="PDFPrevHndlr.PDFPreviewHandler"   You can alternatively download the .reg file shared below and double click on it and registry entries would be automatically created. https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:e94a84df-fa43-4b26-99bf-c1906c783c2b    Please note that running .reg files changes the system configuration, so please ensure to verify the source and content of the file before running it on your system. Thanks, Ankit  Adobe Acrobat software engineer ... View more

@morb!d  if there are other compatibaility issues as well, then instead of completely disabling updates, you have option to only disable auto switch 32 to 64bit. Follow the following steps. 1. Uninstall 64-bit Reader installed on the machine. 2. Restart the machine (optional step) 3. Create the key to block the upgrade [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown] "bUpdateToSingleApp"=dword:00000000 [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown] "bUpdateToSingleApp"=dword:00000000 4. Install 32-bit Reader from https://get.adobe.com/reader/otherversions/  select OS  & langage from drop down select 32-bit Reader from drop down and then install 32-bit Reader.   Likes   ... View more

@Acora One refer answer from @amangupt on this thread https://community.adobe.com/t5/acrobat-reader-discussions/disable-automatic-update-to-64-bit-reader-dc/td-p/12380707 . ... View more

@Country Consulting  DMed you the steps. ... View more

Hi @Coralie - S2E Impressions  You can use the following guide to rollout to older version of Acrobat- https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:96e1e8b1-ab73-3dee-ac10-ca58978b0597 Please note that "Keeping auto update enabled" is essential to keep you updated with latest security mitigation, however as I mentioned in doc, you can turn it off temporarily until the reported issues with these plugins are fixed. Please keep following with the concerned plugin vendors. Thanks, Ankit. Adobe Acroabt Software Engineer  ... View more

Hi @shanes6543654  @Abambo  @ah-falbala  I have DMed you steps for installing older version of Acrobat, please let me know if that works.  Please note that you should update to latest version of Acrobat once the issue is resolved from enfocus side as the update carries security fixes. Ankit Adobe Acrobat Software Engineer ... View more

@default5zpcveok22o6 @done, please let me know if that works? ... View more

Hi @defaults3f3n9vkgnu3  Please use the solution described by @Ravi Gour  in the https://community.adobe.com/t5/acrobat-reader-discussions/adobe-reader-changing-itself-to-64bit-when-we-need-32bit-for-the-preview-handler-in-outlook/m-p/12397088#M83425 thread. Solution is: To revert back to 32-bit version of Reader, please uninstall 64-bit Reader, install 32-bit Reader from https://get.adobe.com/reader/otherversions/ (select 32-bit version to download from dropdown). Create following registry key to block automatic upgrade Key: bUpdateToSingleApp , Value = 0 , type = dword Location : HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown   ... View more

Hi @morb!d  @DrBob  I have DMed you a workaround to fix this problem of outlook preview not working with 64bit Acrobat. Can you please try that solution and let us know if that works? Ankit, Adobe Acrobat Software developer       ... View more

Hi @morb!d    This issue seems like due to incompatibility of 32bit outlook preview with 64bit acrobat. I have DMed you a workaround for the same. Please try that and let us know if that resolves the problem.   Ankit, Adobe Acrobat Software developer ... View more

Hi @default5g4ak4f94c0n  @gndelectrics5C1F    This issue seems like due to incompatibility of 32bit outlook preview with 64bit acrobat. I have DMed you a workaround for the same. Please try that and let us know if that resolves the problem.   Ankit, Adobe Acrobat Software developer   CC @Meenakshi Negi          ... View more

Hi @Addy5E35, We have released an optional update which addresses drag-drop related issues with the sandbox on. Could you please try updating your software? Release notes: https://www.adobe.com/devnet-docs/acrobatetk/tools/ReleaseNotesDC/continuous/dccontinuoussep2020qfe.html#dccontinuousseptwentytwentyqfe   Thanks, Ankit Gupta Software Development Engineer, Acrobat ... View more

Thanks for reporting this issue. We are currently investigating this. Ankit Gupta Software Development Engineer, Acrobat ... View more