All aircraft in my 737NG series have stopped loading since I applied the FS9.1 patch. There seems to be a problem with the panel. Everything is up to date concerning the 600/700 and 800/900 series (1.3 and 1.1 versions).:-hmmm

Did you install FSUIPC v3.40?

Mine loads but all my engine gauges are all dead./johan

Yes I have the latest version of FSUIPC.... :-hmmm

I forgot to mention the PMDG 737NG doesn't just not load, it crashes FS2k4 to the desktop...

How about Active Camera? Have you downloaded the correct version for the patched FS2004?

Yes I have the current version of Active Camera...

I didn't have to reinstall any aircraft after the patch (although I did have to reintall FS from CD, then apply the patch.Sounds like an FSUIPC issue. Active Camera just causes a CTD after a few seconds if you haven't it patched, but the PMDG should function.Do you have another panel that uses FSUIPC?

I found the problem guys... I think one thing PMDG did with this 737 versus other add-ons is put entries in the registry concerning the panel (I don't know but I think this is the case). Anyway I ran a program called 'RegScrub' that supposedly wipes away all the pointless entries in your registry a while back. I found my computer was booting up too slow plus I needed to clean out any entries left by Trojans.Anyway I found that RegScrub sometimes deletes valid entries as well. I reinstalled my PMDG 737s and now everything works as it should. The only answer I can think of is RegScrub so maybe PMDG can comment on that.Thanks PMDG and everyone else for helping me out here. Hopefully this thread can help someone else experiencing this same problem....

No, we categorically do not put any entries in the registry.Something else did it, most likely, and things got screwey.

Well it works now so I'm happy... :-) Thanks for the help...