[@jaredatch Member 14 years, 7 months ago]

You don’t need to revert your permalink – you don’t need to even change them.

When you go to Settings > Permalinks, simply loading that page triggers permalinks to be flushed.

As to why it won’t work with pretty permalinks, it could be a combination of things really. Does *any* part of the forum work with pretty permalinks? Does the rest of your site work OK with pretty permalinks?