THEBERBSTER has a posting somewhere on the site, but I can't remember if it's in the SH3, 4 or 5 section... can't seem to find it. I just saw it the other day... Anyway, I wouldn't roll back the update. I'd roll back the driver, but I don't remember what you had to do to accomplish that...
OK, duh... very first post in that first link I gave you... wow!
http://www.subsim.com/radioroom/show...09#post2408009
it links to a Living Silent Hunter III thread, but the same applies...
... and then there's the "v-sinc" thing that might help, and is easier to do:
http://www.subsim.com/radioroom/show...90#post2502790
(thankfully, elameno just posted in there...
)