I am getting this error as well. It's not too big a deal right now, because I just let it do it's thing and then I get the close/debug message and I just close it out. Nevertheless, it does always give me this error with TBS3. I'm hoping there's a fix soon.
One additional thing I noticed is that even if I open TBS 3 and don't open or load any articles, I get a message asking me to save my work before closing. However, I didn't have anything open that needed saving! Just wanted to put this out there in case you guys weren't aware.
thank you,
Eric