We encountered a problem where a lot of black box on the display when using RDP and Remote Desktop Connection Manager when access our virtual machines. This prevent us from seeing clearly and unable to click any icon.
We have tried to removed and update our display driver however the problem is still persist on our source machine. So now we sure it is not the driver issue but operating system issue.
Then we change RDP file to disable bitmap cache. Click on Experience tab and uncheck “Persistent bitmap caching”
Problem solved for RDP but still can see “black box” when using Remote Desktop Connection Manager. Too bad, we cannot find option to disable bitmap cache.
So we use another workaround by delete cache from our source machine. Go to
|C:\Users\<username>\AppData\Local\Microsoft\Terminal Server Client\Cache|
Delete all files inside Cache folder. Make sure no remote desktop connection is active.
Once we empty the cache, our problem solved for remote desktop connection manager.