I'm having the same (or very similar) issue. When I start Screenshot Captor, I get this error message:
The work item queue of the TWorkerThreadPool should be empty now, nut the number of elements were: 5
(C:\Libs\BCB6\JAMSoftware\ShellBrowser\BCB6\lib\ThreadPool.pas, line 820)
Once I click OK, the error box disappears and another exactly like it pops up. I end up having to click OK on a total of 6 error boxes before I can use the program.
Another curious thing is that the thumbnails on the left side of the program refresh themselves approximately every 5 seconds or so. This makes working with Screenshot Captor almost impossible because when you select any thumbnail other than the most recent one, in five or so seconds it resets itself and the most recently taken thumbnail is active (has focus) again.
This was not happening when I first upgraded to this version, but suddenly this bug appeared.
Possibly useful info:
Screencaptor Version 2.30.04
Windows XP Home Edition Service Pack 2 (build 2600)
3.20 gigahertz Intel Pentium 4
1022 Megabytes Installed Memory