Having problems posting? Here are some ideas.
1) AOL might be the problem. If you have AOL, it's been known to not play nice with certain forum software. There is nothing that I know of that will fix it.
2) Cookies. Do you have cookie enabled? They must be enabled to post.
3) Security. Is your security setting REALLY high? It might prevent you from posting. Adjust your browser's security level and it will probably fix itself.
These seem to be the three most common reasons people cannot post or log on. If you have experienced a different problem and know the solution, please let me know.