VST Plug-in picture at media rack disappeared

Suddenly, the VST plug-in pictures at media rack disappeared. I upgraded to
Cubase 10.5 week ago but the pictures were exist after upgrade for a week.
When I try to add the pictures again for every VST plug-in using the camera
button in the plug-in control panel nothing happened and no pictures added
to the media rack.

When I opened my old version Cubase 10, I found the same.

What new I did recently is to run windows 10 update. When I thought that
this might be the problem and restored the windows 10 to date before the
windows update, the problem still exist.