737NG 600/700 & 800/900 compatibility

[iainsmith 9]

Hi all,This problem might have been covered so please excuse if so. I can have either the 600/700 installed on my machine or the 800/900 but not both together. This surprises me and I'm wondering what is wrong. With both installed when I go to the 2D cockpit of a 600 the engines are running but the instruments are blank as if cold and dark. Selecting the overhead immediately causes the panel to go completely black i.e no instruments or graphics visible at all although outside scenery is unaffected and side cockpit views are also intact.My system is Gigabyte K8 Triton mobo with AMD Athlon 64 3000+, a Geforce 6600GT card with 128Mb and 8 x AGP plus 1Gb of PC3200 DDR400 RAM. I thought this looked like a video driver problem and tried one from my card manufacturer rather than the Nvidia WHQL driver that I'd been using but to no avail. Has anyone got any ideas please? TIAIain

[iainsmith 9]

It's ok sorted! But I don't really understand why. Having the 800/900 installed first and then installing the 600/700 and all is ok! The other way round and the problem! As you Americans say - go figure!Iain