I'm sorry for long reply.
If you still experience that problem, could you do a few following things, please:
1. Download and install a new special build of the program. You can download it here: http://safelyremove.com/upload/usbsafel ... _4-3-2.exe
2. Set option "Enable verbose logging" in Options window;
3. Try to repeat that bug by hovering or using left click.
4. Send us log-file of the program. You can find it here: C:\Documents and Settings\UserName\Application Data\USBSafelyRemove\USBSafelyRemove.log.txt
I will try to help you.