Why do I keep getting this when I try to post?
 

"Thank you for posting! Your post will not be visible until a moderator has approved it for posting. You will now be taken back to the forum. If you opted to post a poll, you will now be allowed to do so."

This only just started happening, why? How long will it take before my posts show up?

When posts are flagged for moderator approval it can take anywhere from a few minutes to a few hours for the moderators to handle the request.