Hi Mustang1977

FF was ok. It has never been an issue with any other add-ons, so I ruled that out. That was not the issue.

I had stupidly, while following the Tutorial for the CS L-1011 which sets the fuel load in kgs, changed the Unit of Measure settings to metres, but did not twig that it also affected aircraft altimeters, hence when I was at 12000m, I mistakenly thought it was 12000ft, and wondering why it was climbing slowly and not getting to CL. Not surprising with a 50% fuel load.

Today's flight, even with full 100% tanks, I was at 31k CL at a point above the east coast of England as the AivlaSoft EFB predicted I'd be. Result.

Now to configure the CIVA  INS, next. :D :D