I am getting these crashes as well, but wouldn't put it on version 1.2.
I removed XEnviro and I am able to complete all my flights. I am almost sure that XEnviro is the reason. Looks like whenever xE is updating weather AND is not able to reach their server at this time, a crash is probable.
Let's hope, this is fixed in xEs next version, whenever it will arrive.
Until then, I'll use XPs default weather, which is not to bad as well.
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