Jan and Jure,>>for what it's worth, I also have FlyTampa Vienna, but noUltimate Terrain. My every flight to LOWW in the PMDG B744 wassuccessful. And I had quite a few, since I fly in Europe a lot. <

Ryan,>>This is exactly right based on what I know as well... That is absolute nonsense where someone said that your pagefile should be at least twice the size of your RAM. The OS swaps to the pagefile (aka "disk thrashing") when it runs out of physical memory - on a 2GB machine this will almost never happen unless you're running a demanding game like FS or doing big time photo/video/music editing. If I had 16GB of RAM for instance (which is possible on 64 bit machines), that would be absolutely ridiculous to say I needed 32GB of pagefile lol... The whole point of having huge amounts of RAM is to minimize any pagefile use at all.<>Leave it set to system managed guys, the OS is smart enough to resize the file when it needs to. The OOM errors are technically a user address space error, not anything having to do with physical RAM or the pagefile. It's a limitation of 32 bit operating systems that we're starting to push up against. Hopefully 64 bit will start to catch on and we'll be rid of this.<

to Lee and Jure: I fully agree with what you are saying, Ultimate Terrain is a complex addon that will most likely cause conflicts with other add-ons, especially scenery add-ons. Getting all the add-ons to be compatible with UT is a never ending project.I guess the only reason why i get those OOM messages at LOWW is because of a bug in UT + the fact that the 747-400 does consume a lot of ram when being used by itself. I often see it using up to about 70% of my RAM while on ground (i have the G-15 keyboard, so i can see the cpu and ram usage while flying).Hopefully they will take a deeper look into the UT series for FS9 after the FSX versions have been released :)Kind RegardsJan

Hi again,Just wanted to say that after two online flights, one a 12-hour hop from EGKK to FACT and another today from EGCC to EGLL, I seem to have cured the memory errors.I even installed the new LHR2008 scenery and did a test flight today and another online trip this evening - all solid as a rock and the PMDG 744 flies really well!I'm happy :-)I'd like to thank all those who have contributed to this thread and who have assisted me (knowingly or unknowingly) in eradicating the problem.Now, back to flying the big bird !!cheers,Lee