Now I had no time to visit this forum for some days and so I missed this thread...
But interesting, I had just this days the same issue with MiniCap (based on ScreenshotCaptor).
I have a script to capture every 3 seconds and on mouse click.
Works fine after I read the help how to make individual file names
for about 20 minutes and ~600 files, then I can't let work MiniCap again.
(VirtualPC W7/64, only 2GB RAM)
I wanted to look on GDI issue too, but then there were other things to do.
I switched to Automatic Screenshotter and that works fine with "every 3 sec" rule, but I miss "capture on mouse click".
So it's fine you work on that already