The new YaBB (forum) software thinks that people who post too often/quickly might be spammers, and eventually disallows posting.
I can live with that; it even seems like an OK idea. However, the software seems to treat the "Preview" function the same as the "Post" function for this algorithm. If I preview my message, decide it looks good and click the "Post" button (or where it used to be), I get the "spammer warning."
The delay for not getting the warning is not overly long, but this still seems like an actual bug...