747 won't hold altitude or keep speed

[saltypete]

Hi All, i have had 300 trouble free hours in the 747 until today. I am not sure if this is related but i downloaded the trial version of ultimate defrag and ran it last night. Today i set up a flight in the queen fromm EGLL to KSFO and got airborne and at 1000 feet engaged the left CMD and the trouble began. The autopilot did not follow the flight director and the airspeed went up and down past the limit that V Nav set, when 10000 feet came the speed rocketed up and fell down. As i mentioned the aircraft was out of coordination with the flight director in a nose up attitude that bled off speed. I eventually got to cruise level at 30000 feet and the plane kept climbing through the altitude set in the MCP/FMC and then diving below it, no matter what mode i used (V Nav, FL/ch, Alt HOLD) it would not stay at FL300. The FMC told me that OPT cruise was 30900 and max was 34800. I have searched the forum and have not found any answers. i am going to reinstall the Queen , the freighter pacakge and the sound update and see what happens. I really don't know what else to doBest RegardsPete Carlsen

[saltypete]

Hi again, i managed to solve this issue by restoring my system to the settings i had prior to running the trial version of ultimate defrag and reinstalling the entire 747 set up (400, 400F & sound update). I am assuming the defrag had something to do with the problem, so other users beware that it may cause problems. It has taken about 5 hours of stress to solve this problem, but at least i can go flying in the Queen tommorrow!! Good night allRegardsPete Carlsen YBUD