I am able to enter my question in the edit box, but the 'Post' button does nothing. I don't see anything about this in the FAQ.
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Is your question too long or too short? I've had this happen where I click Submit a couple times with no apparent result before I notice a message about a problem with my question.
I have no idea how the area51 site proposals work internally, so this is going to be just speculation, but it could always be a browser-side issue. Could you try testing a question post using a different web browser?