I use Adobe Acrobat through my entire Engineering Consulting Business (Bowden engineering Solutions Pty ltd), but I have a bug with Acrobat DC Pro. I am running it on a laptop that has on Windows 10 and a second monitor that is connected with HDMI and positioned above the laptop monitor. The laptop monitor is still selected as the "main display". The bug occurs about 50% of the time when I open an Acrobat file. The Acrobat window maximises on the second monitor and there is a blank portion along the top of the Acrobat window that covers the menus, the ribbon, and the top of the document. The window controls are still visible, but they do not work (i.e. I cannot resize the window). If I unplug the second monitor, then the Acrobat window moves to the monitor on the laptop and works fine there. If I then plug the second monitor back in and drag the Acrobat window onto the second screen it is fine. If I maximise the window, then it is the same chance of the problem re-occurring.

The bug is intermittent, and I did not get it to reoccur when I was writing this bug report (I tried 5 times to get a screen shot of the bug). So the attached picture is not an exact screen shot of the bug occurring but it is very similar. Note that the Adobe icon and file name should be showing on the top left but that is also missing when the bug occurs.
I have tried reinstalling Adobe Acrobat and the bug still occurs.

I digitally sign/approve about 200 documents per month that are created by my staff (about 10 per day) and in that process need to look at several other pdf's, including aircraft manuals, regulations specification etc. In addition to that, I need to work on my own projects (that are issued as pdfs). So, I almost always have several pdf files open in Adobe Acrobat and rely on this software.

If this is known bug then any assistance would be greatly appreciated.

Regards,
Denis Bowden B.Eng