I have got two CTD's with PMDG 747-400 in exactly same kind of situations. When decending to given altitude at approach with AP on (HDG and V/S guidance) I select DEP/ARR in FMC and there ARR from sidebuttons and the correct (given) runway to land on. When I press the sidebutton for the rwy I get CTD. Or more specifically the screen goes black and stays there until I tap ctrl-alt-del to get task manager open. That shows that the MS FS does not respond anymore.My settings are: MS FS (Upd 9.1) + PMDG 737-800/900 (1.10) + PMDG 747-400 (with latest update) + MyTraffic2006 + Updated SID/STAR's from PMDG.The first time it did this the MyTraffic2006 wasn't installed.System specs are: P4HT + 1Gb RAM + AtiRadeon X800 XTPEThanks in advance: Markku

I think problem is solved:I installed 747-400 service update on top of everything and alsochecked the order of sceneries (Scandinavian Airports, which I noticed to have also, on top of MyTraffic sceneries).I also did what they advise here:http://forums.simflight.com/viewtopic.php?t=47430Also increased my PC's virtual memory to constant 3MB.And for my system, it made a difference. Stuttering is gone and the system has at least after two fligts in 747-400 and 737-800 (PMDG's both) no crashes./Markku>I have got two CTD's with PMDG 747-400 in exactly same kind>of situations. When decending to given altitude at approach>with AP on (HDG and V/S guidance) I select DEP/ARR in FMC and>there ARR from sidebuttons and the correct (given) runway to>land on. When I press the sidebutton for the rwy I get CTD. Or>more specifically the screen goes black and stays there until>I tap ctrl-alt-del to get task manager open. That shows that>the MS FS does not respond anymore.>>My settings are: MS FS (Upd 9.1) + PMDG 737-800/900 (1.10) +>PMDG 747-400 (with latest update) + MyTraffic2006 + Updated>SID/STAR's from PMDG.>>The first time it did this the MyTraffic2006 wasn't>installed.>>System specs are: P4HT + 1Gb RAM + AtiRadeon X800 XTPE>>Thanks in advance: >Markku