Installed the Thomas Ruth 727 mega pack last week into one copy of my FSX install and since that time have had a number of CTDs on different copies of my FSX installations. I am not sure if Ruth's pack is totally suspect here because sometimes the CTDs occur on different installations, and sometimes they don't. The packs were installed by me into the 1960s airliners copy of FSX and there have been no problems with that sim after the first CTD; last night I was starting a different copy of FSX in which I have all prop-driven payware installed; there never was as problem with that copy until after the 727 mega-pack installation on a totally-different copy of the sim, which is also on another drive. I'm wondering if it might have anything to do with the "Red Panda" app which shows up in all copies of the sim.