Got an interesting one here:
Have been working without issue in uV4 for a day. Re-open the same project the following morning and continued code changes. This compiled correctly, however, when I clicked the load button everything froze. You can minimise and maximise it, but that's all.
In task manager there are two instances of uV4 shown, both not responding. When I attempt to close the application I get the usual "are you sure" messages, but nothing happens. In Task Manager Processes, a single instance of uV4 is shown with no CPU usage, but even "End Process" or "End Process Tree" have no effect.
I'm going to have to reboot the computer...
I'm working on XP pro 2002 SP2, with uV3 v3.70 and uV4 b1.