We recently updated our machines to Adobe Reader DC 19.08.20081
Simultaneously we updated Windows 10 to 1803.
After these updates we have discovered an issue opening more than one PDF at a time.
Users can open the first PDF normally. Once the reader is open, however a second PDF cannot be opened by clicking on the PDF. Double clicking will add the PDF the to recent files in Windows, but it does not create a new tab or window in Adobe Reader.
What does work: A user can open a subsequent PDF in the File>Open menu, by going to the Home tab and double clicking on a PDF in the recent files, or by dragging a PDF file into the reader.
I have also discovered that by disabling Protected Mode it will work normally, however we would rather not disable this.
I added the location of the files to the Privileged locations, but this also does not allow the files to open correctly. All the workarounds continue to work.
We tested this version of Adobe in a previous version of Windows and did not have the issue, so it seems to be something in Windows that Adobe is not playing nicely with. We confirmed this by testing a previous version of Adobe on a device with Windows 10 1803 and could duplicate the issue. So it's definitely something in 1803 that is breaking Adobe Reader.
Any assistance resolving this would be appreciated.