I've noticed this a little more recently, where Imagetool crashes while switching cameras. It typically involves either getting a whole series of errors (timeouts/setting failure/mooc) or it simply stops responding, not responding with any error but also failing to allow any action other than closing it, which it seemed to do cleanly. This was while working with DC1, which seems to pop up these problems more than the other servers (though that may just be because it's the first one so it's the one I typically go to first), so it may be test code that Charlie is running. It also seems more likely to happen with the Virtual Cathode camera (perhaps due to the resolution?). In any case, a reset each time was required to DC1 to bring it back and once it was working with a camera it seemed fairly content to continue doing so.