As people have realized, having shadows to low causes crashes on these two maps. What this does in ROEngine.ini is to set "DynamicShadows=False", I've tested it a lot today this is what's causing the crashes. The reason someone would want to have that as false is that it removes the shadows that soldiers cast, a pretty small graphic difference that will give you 20fps EASILY. You can test this on GrainElevator, it makes a big difference. You can also try "LightEnvironmentShadows=False" which removes all shadows from the map but that will crash the game in the splash screen. They might be related.
If you crash in GrainElevator too, and at random times, try turning down texture quality to medium or low. The thing is, if you have a 32bit operating system, it doesn't matter how much video card memory or RAM you have. Most engines these days are made with console limitations in mind, the engine can't fathom running out of memory when it's running the same system on all users (consoles), so when it does run out of memory, there's no warning, no backup, just a crash with a useless non-descriptive error, sometimes a blue screen, or a black screen. If that happens, don't try to run the game again before restarting your computer, the graphics card is already screwed, and will give you more and different problems when you run the game after the crash.
So my advice is, have shadows and texture quality to medium, this should fix the widespread crashes. For anything else, it's probably something more obscure related to your system.
If you crash in GrainElevator too, and at random times, try turning down texture quality to medium or low. The thing is, if you have a 32bit operating system, it doesn't matter how much video card memory or RAM you have. Most engines these days are made with console limitations in mind, the engine can't fathom running out of memory when it's running the same system on all users (consoles), so when it does run out of memory, there's no warning, no backup, just a crash with a useless non-descriptive error, sometimes a blue screen, or a black screen. If that happens, don't try to run the game again before restarting your computer, the graphics card is already screwed, and will give you more and different problems when you run the game after the crash.
So my advice is, have shadows and texture quality to medium, this should fix the widespread crashes. For anything else, it's probably something more obscure related to your system.