Bov, I'm still using DX7 as others I know have had unexplained illegal errors causing FS2000 to shut when they have 'upgraded' to DX7a. BTW I had all sorts of problems runnnig this program on my first install, some of which have been mentioned elsewhere on this forum...all have now been resolved and the program is running just as the maker intended. WRT DX7, I actually installed DX7 off a mag cover CD so I could chose not to install it from the FS2000 setup program. Unlikely though it is, the DX7 off the FS setup may be the cause of your problems. And to answer your next question, my initial problems also came after an initial period when everything was working fine.