It was released on the 10th ... Release Notes | Adobe Acrobat, Reader ... View more

Does Adobe have a status page of these problems and their current status?  If so, can you provide the link, please? ... View more

bobinyo said, "There are so many different options in Windows, and I think most people don't remember what they checked and unchecked when setting up their computers" You are exactly right.  As an IT professional I've learned that most settings are good to leave as default.  However, I do have a series of settings that I alter when I open up a new computer.  "Show file extensions" is among the first on that list of things-to-do.  😉 Just remember, with that setting turned on, you'll now need to be careful to not remove the extension if you ever rename a file.  For example, you might rename an image you pulled off of your phone from "IMG_1234.jpg" to "Our Pet.jpg".  Just be sure to keep that ".jpg" on there.  If you ever do remove it accidentally, simply rename it again and add it back in.  Windows will warn you that you're about to remove it, so it's actually difficult to do that. ... View more

Every file has a file extension, like ".dat" but Windows, by default, hides them so it doesn't confuse the user.  I personally don't agree with it but that's another story (see tl/dr below).  In cases like this, you can set Windows to show those extensions by doing what I suggested above to mykl66's post.  It's in that same "Folder Options" section, in fact, it's right beside "show hidden files and folders", it's called "show file extensions".  You can turn that on, see the ".dat" or any other file extension that might need viewed and then turn it back off if you prefer not to see file extensions in the future. tl/dr For those that care, the reason I don't agree with the 'hide file extensions' setting, hackers use this to trick you.  For example, you can get an email, with an attachment that has an Adobe Reader icon which makes it look like a "PDF" (which is a file extension by the way) but instead of having that file extension, it really has a ZIP extension.  But, because your computer is hiding file extensions, you think it's a PDF, so you double click it.  The zip file opens revealing another file with a PDF icon but this one is actually an EXE extension.  Again, you don't see the extension, and even though you think it's strange that another window opened after you clicked the first PDF file, you simply click this file too, and you've just installed a virus.  The ZIP extension allowed it to get through your spam filter (most will allow those through by default) and the EXE file is an executable file that happened to be a virus.  Please understand, EXE files aren't necessarily bad, in fact, every program on your computer will have it but if you have Windows configured to SHOW file extensions, then if you ever see an EXE as an attachment in an email or within a ZIP file, OR if you ever see a ZIP or an EXE file that has an icon that doesn't match (like Adobe PDF icon), then your red flag should go up, you should hear warning klaxons going off and you should NOT click those files, other than right-click > delete.  The only reason Windows has this setting on by default is because if you ever rename a file and don't keep the extension, you effectively neuter that file.  For example, MyDocument.DOCX is a Word document.  You double-click it and it opens in Word.  If you remove DOCX, the file still works but Windows now doesn't know to open it with Word.  That DOCX extension tells windows what to do with it when you double-click. IMHO ... View more

No, the problem has gone away after deleting the file that had 65536 in the name.  First I just deleted the one mentioned in the answer, "IconCacheRdr.dat" but that didn't fix it.  Then I deleted "IconCacheRdr65536.dat" and the black box is now a black pointer arrow again. For what it's worth, I have 15 PC's in our office and only one has faced this issue.  All of those PC's have this 65536 file for the user who logs into it everyday.  I did notice, 3 PC's that have old user names (people who no longer work here), their "AppData" folder doesn't contain this 65536 file so I'm guessing it's a recent addition?  Again, that's just a guess.  I am not an Adobe developer (or employee for that matter). HTH Futile ... View more

mykl66, By default those folders are hidden in Windows.  Do you have "Show hidden files and folders" turned on? In Win10 you should be able to type "Folder Options" in Cortana box.  click the Folder Options that displays and in the window that appears, select the 'View' tab.  Near the top of that list of settings, you can "Show hidden files, folders and drives" (or something like that, I'm using Win7 so it may not read exactly that way).  Click APPLY on that window (but keep it open) because after you find this hidden file, you should turn that back to "Don't show hidden files, folders, or drives". Also, read my post right above yours.  I had a file called IconCacheRdr65536.dat so you may be seeing that one and not the other? ... View more

I had to delete one called IconCacheRdr65536.dat I did the suggested fix, removing IconCacheRdr.dat but it didn't work (Yes, Adobe Reader DC was closed at the time).  I also noticed that the file wasn't recreated when starting Adobe Reader DC again.  I also noticed that this 65536 file was in there the whole time too so I closed Reader DC, renamed that file with a ".OLD" and restarted Reader and this fixed the problem.  Also, I noticed that the IconCacheRdr65536.dat file was recreated. The black box is gone, the black arrow has returned and I still don't have a the original IconCacheRdr.dat file.  I did delete the ".OLD" file after everything was working again. I'm running Win7 Pro. ... View more