I never intentionally click it, but it's happened so often, I now make a habit of checking the clip in the Timeline after I've done such an edit to see if it was accidentally done.
Not ready to say this is a PD bug, but something is turning that attribute on. Maybe there's a "too sensitive" spot on the dialog, near the Save button? Chuck Puckett
"I don't want to steal the show. I only want to borrow it for a while"
http://www.puckettpublishing.com
http://www.chuckpuckettsongaweek.com