No, refresh automatically isn't set. I have played around with the
preferences quite a bit, and nothing there seems to be in. I am becoming
pretty sure that this is the PDT itself that is doing this.
This problem also makes simple things like hitting the down arrow really
slow (the caret lags). I guess I will file a bug and see what they say.
If any one else (or any developers of PDT) have any insight, would
appreciate it.