PC anywhere 12.5 only see a black screen

Hi there, I have searched through the forums, but can't seem to get a resolution for this. I know its posted else where, but I can't seem to get a fix.

When we connect and I do connect different hosts sometimes it just shows a black screen. you can transfer files ok, but can't see anything other than a black screen.

these are all servers we are connecting to, so rebooting isn't really an option.

pc anywhere 12.5 ,the clients are windows 7, connecting to win 2k, and 2k3

thanks in advance