heya !
jep, its is a well known and documented
(see several forum threads) ug in rc 4. unfortunaly I can't help with your problems using the patches as im using the svn. maybe thats worth a try for you as well ? there is a quite decent step-by-step introduction about what to do on the wiki. well, most likly your savegames will be broken afterwards.
sorry for beeing unable to be more of a help, Eric.