I have been reading all the stuff about windows 8 and FSX. I have 8.1 and FSX runs great. I loaded the ESDG citation x 2.0 and it seemed to work great too. I flew it from KTUS to KSNA and back and it did just fine. Made a preset loaded flight for it, that worked fine. Then one time I loaded the aircraft, had it up and running, and went to load Opus weather. Ever since then I can't get this aircraft to work, it won't even load. I deleted it, re-installed it still nothing. FSX and Opus work fine with jet installed or uninstalled, this problem only happens when I tried to load the citation x.