I have TaskCoach 1.3.16 installed on Windows7-64bit. Recently I encountered some problems when trying to mark (only recurring?) tasks complete. It only happens after TC is running for a longer time and my suspicion is it has something to do with sleeping/waking up the laptop. There is some error in the log which I'm attaching.
Thanks for looking into it and for the great job you have done on my most favorite task management tool!