Hello folks,I did the suggested procedure to uninstall the old version, then reinstall it and then the SP1. So far so good, it's very stable now, no ctds or freezes after a few hours flying with the new SP1, but I noticed a few things that had changed. Firstly, when ready to start up, grab my checklist and what a surprise when turning the packs switches off I noticed that the ducts pressure actually drooped instead of rise!!! preventing me to start up. After switching back and forth with the isolation switch which it is supposed to be at open position to feed air pressure to the no. 2 engine, suddenly rose and I was able to start that engine, then and ready to start up no. 1 engine same thing happened again, low pressure even feeding no. 2 engine's air, the pressure gauge still around 10 to 15 PSI. Sure I tried my checklists twice to make sure all is ok.Can anybody please check if this issue it just happend to me or is it common around SP1?Secondly, I noticed a big changes in the sounds where actually now is missing that quite particular engine sound at TO powersaddly removed now, then the other changes are all concerned about sounds at touchdown, much better now, the airstairs own sound it's just great, beside a smoother rides on my rig.Any suggestions are much appreciated.Art Washton.