Transmission

Is it possible that it has something to do with the "Automatic graphics switching" feature (http://support.apple.com/kb/TS4044)? I don’t have access to a 13" rMBP, but I imagine that someone who did would be able to confirm or deny this as a possibility.

I’ve got the exact same configuration machine, purchased just a few days ago, and am experiencing the same issue. It’s definitely related to Transmission, though, and occurs even if no other applications are running. Just wanted to make sure this received the appropriate amount of attention.