my issue is quite similar to this post: MSTSC: Black Areas on Remote Desktop
We have multiple users with Dell WYSE 3040 thinclients having the issue of black squares appearing on their display while being connected to our Terminalserver. I tried the given steps, but it didn't help. Also there are no similar settings in the thinclients menu. I just tried the method of deleting the cache.
The devices are new and it happens almost on every one of them. Also I changed the wires and everything, but I didn't find a solution yet.
Has anybody else experienced something like this?