I tried to accept the lanthic mining mission in Odia C-2, and the game crashed (Windows 7, 64-bit). When I reloaded it, I tried to accept the mission, but it then said that I was "not allowed" to accept the mission. So I tried the apicene mission, and the same thing happened. Now I'm essentially locked out of those two missions. I'm not sure if this is an actual bug, or something related to the mining station hating me for not completing the mission. My standing is still positive (around +108), and I can accept other mining missions from the station. Any ideas?

That mission may only be taken 1 time in 3 days, to prevent farming issues. Logoff/crash basically equates to failure. It should become available again within the next few days. The mission being displayed but not being one that you can take is probably a bug from our recent mission-interface changes.

Had you attempted or completed the Apicene mission recently? That probably has a similar restriction.