On Friday afternoon Terry McRae and I crashed several of the ZOTAC workstations in the control room by dragging and dropping channel names from the INMONs of the OMC QPDs into the terminal. Dave Barker tried this on his workstation and it was fine for him.
In this situation the workstation completely froze and the solution was to ssh in from another workstation and pkill medm.
Now I am trying to redo the dark offsets for the AS WFS, and having a similar problem. When I try to middle click on an medm screen and drag it into the terminal, sometimes it works but it seems like about 50% of the time medm crashes. The workstation doesn't freeze, although my dataviewer did freeze. I cannot reopen the sitemap. Again this is a ZOTAC workstation.
When I've experienced this I was able to "snap out of it" by center clicking the mouse into a terminal or the like. Unlike with the old work stations where you just drag and release into the place you want to paste, I think here you have to drag, release, and then click. I think medm and X hang waiting for the copy/paste to complete.