SQL window -> select text -> hit Crtl-C (or Ctrl-Ins).
But the text was not transferred to the clipboard.
This happens rarely, but is very disturbing.

Even worse: select text -> hit Crtl-X.
The text is gone, but nothing is in the clipboard.

The same with: select text -> menu -> Edit -> Copy (or Cut).
Rarely too.

Sometimes if this occur I can't copy although I hit Ctrl-C several times.

Only PSD has this problem. Other programms on my PC work well.

I had this problem on my other PCs too.