PROBLEM VRX Cross 1.5

Hi Guys, Just finally after the 15 day trial period purchased the full version of Cross 1.5. Now the problem starts after about 3 hours of working the right deck freezes. In other words it wont play! Loaded the same song in the left hand deck (waited until the left hand finished playing) and the song which was loaded into the right hand side and did not play , Plays perfectly on the left deck. So the problem is right side (nothing to do with the song.) This has happen twice. I had to close the program and restart in order to continue. I am running Mac book pro 4gb ram on 10.5.8