Black screen using snipping tool

Hi all

We've just migrated some desktop from w7 to windows 2008r2. Some users have got problem with snipping tool, when users capture the screen the desktop goes black and the only solution is reset or restart it from a remote host.

Our infrastructure is

vSphere 5.5

Horinzon view 6.0.1

Desktop Windows 2008r2 sp1

Some advice?

thanks

Matteo