I've noticed that PPro CS4 (4.0.1) acts very sluggish after rolling a DV project off to tape (on my DSR-11 deck). If I try to close the application (or do anything), everything takes a about 10-20 seconds to respond. And it's impossible to roll anything else off to tape. I have to re-boot the computer to roll off something else - shutting down PPro and re-starting doesn't work.
It only seems to do this if the project is 5 (or so) minutes or longer...shorter projects don't seem cause this.