I have no idea at the moment what could cause this but it sounds to me as if your PC is not capable to handle it. Some more informations about your hardware would be helpful. I also don´t know your ingame settings, maybe they are just too high.
Here are some of my specs:
Intel Core i7 CPU 3.07 GHz
8 GB RAM
NVIDIA GeForce GTX 470
Also to my opinion my FSX graphics are not set too high
.... I have experienced the same thing in time pass. Have you downloaded and installed the latest service pack 4 for the A340-500/600? Don't forget to apply the rain fix found on the download page.
Once you've installed service pack 4 that should fix the problem (in expense for a few random crashes thereafter). Try to open all the panels (shift+ -) AFTER all the textures have finished loading (not while one is still loading, etc), and open them one at a time. Bear in mind that with every new add on the A340-500/600 MAY result in a fatal error (when you try to open sift+ - configs), unless this happens though, you just can't escape it. Simply restart your fsx doing nothing else until the crashing has ceased. Before every flight (once all textures have been loaded) try opening the panels once more (shift+ -) ... shift nine may go blank and your sqawk settings messed up, but, you should be able to recover this from ATC.
... it's a downright pain in the bumb, but, once you get your head around it these black screens and fatal errors will become a thing of the past.
PATIENCE you WILL need...
I dont have SP4 installed but i just downloaded it and it said its "Only required for installations before april 20th"... Also it requires a registration code and i dont have one... I bought this from Just Flight (www.justflight.com) and they didn't give me a registration code.
Also why are there all these problems with this aircraft we paid so much for??? This process you're telling me seems frustrating.
Thank you both for your help so far.