This is infuriating. I wish I would have found this thread sooner because I've spent countless hours trying to resolve this issue.

Is anyone from ADOBE looking into this? I understand that this issue is probably on some a low priority list but this is a very annoying behaviour.

Same problem - I have a Radeon RX580 - and here are my driver versions (in case it's relevant):

Software Version - 2020.0106.1611.29127
Driver Version - 19.50.01.05-200106a-350514E
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 8.1.1.1634
Direct3D® Version - 9.14.10.01432
OpenGL® Version - 26.20.11000.13586
AMD Audio Driver Version - 10.0.1.12
Vulkan™ Driver Version - 2.0.116
Vulkan™ API Version - 1.1.125
Windows Version - Windows 10 (64 bit)

Yeah, but I do this at least six times a day because they keep going off.

HI Mario,

Thanks for Reaching out to us, We apologize for the inconvenience caused at your end,

We have Taken this issue in consideration and our engineering team is actively working on its solution. The Expected solution will be available in the coming release. Will keep this thread posted once have more info.

PLEASE FIX THIS

I can recreate this issue two ways so far.
1. If I open a PDF from an Internet Explorer browser and it opens IN the browser (no other browser does this)
- If you go into Manage Add-Ons and then under Show, select "Run without permissions", click the Adobe PDF Reader and DISABLE
- This effectively makes the app open the PDF itself and not within the browser

2. Any time I attempt to add comments in a PDF, it removes the shadow as well.

I have the following version of Adobe Acrobat Pro DC:
Continuous Release | Version 2020.006.20042

This happens on both Pro and Reader alike.

Oh, I was wondering why this was constantly happening. So Acrobat was causing this all along :P

This is very annoying, please fix this!

This is REALLLY Frustrating.. I don't want to open PDFs within a new tab of same window but open it in NEW WINDOW !! God..

Don't hold your breath. They can't even fix basic issues that have existed in Dreamweaver for years!

Another update, and yet issue still remains!

Still no fix. Adobe are you listening?

Still not fixed 6 months after this has been reported.

I noticed that here the problem is discussed for Acrobat ("Pro"),
but for me at least it is true for (Acrobat) Reader DC.
so I created a separate thread for Acrobat Reader DC just in case, with a link to this page.

https://acrobat.uservoice.com/forums/926812-acrobat-reader-for-windows-and-mac/suggestions/39863482-bug-explorer-window-shadows-disappear-after-openi

but in any case this is very irritating and a very stupid thing to do all the time.

Adobe developers, would you finally do something about it?

yeah, or you can do
1. Windows + R
2. SystemPropertiesPerformance.exe
3. check the "Show shadows under windows" checkbox
4. "Apply"

Same here. Too bad i deployed this piece of **** software on about 1500 machines already.

EDIT: Verified on fresh w10 1909 install + latest Adobe Pro DC
Reported this to Adobe Support. Helpdesk told me problem is not known on their side - It will be internally forwarded.

I had been experiencing this issue after installing DC last week. As a workaround, I created a shortcut on my Desktop to:

%windir%\system32\systempropertiesperformance.exe

I wish Adobe would listen and fix this! I just update to version 20 and it still does it. . . .