[armsys]

Normally a URD, large and small, can be opened within seconds. If your URD hangs for more than 3 minutes, and the CPU usage maxes over 50% (viewable from Windows Task Manager), don't panic.

Your URD will be unlikely the cause.

After hours of testing, it appears to me that %APPDATA%\Kinook Software\Ultra Recall was corrupted. Just delete the folder. Reinstall UR. Your URD infinite hang (freeze) should be resolved. That's, your URD will be opened in seconds. Of course, all your settings will be lost if you haven't backed the folder previously.