It isn't happening while using Weapon for FSX, it is happening on flights with any of my addon aircraft (usually the complex airliners). I thought that the UIAutomationCore.dll was, supposedly, a fix. But thy are already there and it still gets fatal errors. I am starting to get suspicious that the 500GB HDD that FSX is installed on, might be starting to fail.

Computers! It's a love hate relationship. Love 'em when they are working fine. Hate 'em when they're causing problems. ;)