If you set screenshot captor in automatic mode and let it run for a long period of time (I have it set to do a full screen capture every 20 seconds for 9,000 captures -- roughly 50 hours), it will eventually hang with a red icon in the tray. I have to kill it and restart it. The hang happens at different times, usually after running for 20 to 30 hours, or like around 4000-5000 captures. I have plenty of disk space to store the captures, so that's not the problem.
