Though it may be no consolation, I install and run RDS 5.5 under system 9 just fine. I will try to install RDS 5.0 to see what I come up with. In the mean time, if you haven't already, turn off ALL extensions including minimal system stuff, with the exception of the Apple CD/DVD driver and Foreign File Access. Often times, the extensions and control panels under Minimal System can cause conflicts, particulary Open Transport. Just a thought - I'll send again after I get the results from trying to install RDS 5.0. mclarsen