I start the configuration panel the fly, update, start FS.From the panel CFG I do go with start.No Push Back. Voice default.I set my flight. When there are about 2-1 minutes at the end, the flight attendantreported ready for departure. They are making the announcement in the cabin. I didstart the sequence of aes pushbak. I reply to the advertiser ready for dep. In thismonent occasionally crash FS. Only at that monent. Never before or later.I often do I use the defrag and registry booster to correct errors.Other programs used are:Active Sky evolutionVrouteNavigraphVatSpyTrackIR5Cfg Panel iFlyoccasionally teamspeakLast night, no problem, but I followed these steps: iFly disabled fs2crew cfg, + - 1%fuel --- update. enabled fs2crew + - 1% fuel --- update. LIMC-LOWW.I will try to keep this last procedure.I'm thinking it's a problem of registry booster.Best Fabio