Anyone ever had a problem with their CD-Key being in use (by yourself) after being online for like, 5 days?

I went on vacation and left my bot running. I came back, and signed off, and now I can't log on.

Weird.

Edit: Oddly enough, rebooting my computer corrected the issue, which is rather odd, considering CD-Keys currently in use and such are on the Battle.net servers. Rebooting MY computer shouldn't have done shit.

Any ideas?