Hi, I noticed that on the PERF page OPT/MAX FLs are sometimes not calculated correctly it seems (had this also prior to v1.27). I had flights where the Simbrief initial CRZ FL was reported as too high on the PERF page. So I set a lower FL value into PERF CRZ. Message was gone. But all of a sudden the aircraft "corrected" the OPT/MAX FL shown. Example: In my last flight Simbrief calculated an initial FL370. Imported via OSI into the aircraft. PERF showed OPT ~FL350 and MAX ~FL385 (if I remember correctly). So I set 350 in CRZ FL and then OPT and MAX values were re-calculated OPT as FL380 (cannot remember MAX). I then could re-enter FL370 and everything was working fine. So I wonder if those values are somehow not updated when aircraft status changes e.g. cause I load PAX/Cargo/Fuel via GSX. Cheers Thomas