@Zoddi: Gripshift is different in that it isnt free.
Ok, tmaster I havnt encountered this problem before, so my only suggestion would be that there is a possibility that sony have changed the gripshift file to a newer version? Have you downloaded a working version of the game previously; as in downloaded a version that was working when installed via proxy before your 2.01 update?
If you are using an old, working version, then it may be your error. Have you tried using PS3.Proxyserver instead of ps3proxy? you might have some network setting that you have changed that just happened to coincide with the 2.01 update.