I was in the Configure Preferences dialog adding a new menu to my only dock and LBC locked me up but good. I was adding programs to the new menu and couldn't find one of them - damn developers that insist on putting their programs in a program file with a different name: one of my biggest annoyances. Anyway I was looking for the program in the browse dialog to select the program/command and I decided to move my cursor down to my Start Menu>All Programs to find where the damn thing was hiding. Of course the browse dialog for LBC jumped to the root, as is normal. I clicked on the Back arrow to return to the Program Files directory and LBC threw an error popup, though I could not see it - it was partially hiding behind the Browse window. While the error window was open I couldn't select/move/close any other windows at all; apparently the error was locking up explorer.exe. I used Ctrl-Alt-Del to open the Windows Task Manager to try and close whatever was not responding but as soon as I would click on the Task Manager window another LBC error popup would lock up all windows again.
I finally had to shut down using the power button - first time in a very long time I was forced to do that.
Upon restart the new menu node was gone, even though I had clicked on the Save button within the LBC Preferences window a few times during configuration of the new menu node.
Oddly the Event Log has no corresponding event listed. This all occurred on a box running XP Pro SP2.