Guitar Pro help?

Ok so im using the realistic sound engine (RSE) in the program guitar pro.. (version 5.2) and i just got a brand new computer. it is pumped with every new piece of software imaginable ( not literally but its pretty freaking fast ) its got 4 gigs of ram also. so im not sure y this happens but when i use RSE in guitar pro .. any track that isnt using RSE lags about a beat behind the rest of the tracks .. ( im trying to make a symphonic metal song but only the guitars have RSE not the symphony) so is there any fix to this using some program or is there some hidden RSE symphony that i cant find .. please help!