I have now used the updated 737 in FS 2002 a lot of days with flawless VNAV function. I saved a few flightplans in the FMC and could flight them without any problems. Than I saved some more planes and stored them -again only the routes without any settings on PERF page - and took a test flight:
I engage VNAV and LNAV at about 1000 AGL. Flaps up at 186 kn. At about 6000 ft VNAV suddenly disengages and the aircraft continues climbing with SPD engaged but no visible VS. I have not done anything before that occurs. The only way to reengage VNAV is to change altitude on MCP slightly and than to press the VNAV button again. Than the aicraft climbs as usual. This behaviour is present with FSUIC on or off, I have a normal VNAV climb when making a flight plan in the FMC and not using the stored ones. I see the problem both in FS 2000 and 2002. I transferred some newly stored flightplans from the FS 2000 FMC database to FS 2002.
Anyone who can help me with this?