Over the past couple days, I've been noticing this:

I'll write my reply or new thread, and click Submit. Then, instead of getting the redirection page, I get the "invalid link" page. Or, the page telling me that I don't have permission to view it.

I then hit backspace, and click submit again, and everything works fine.

Anyone else having the same problem? How can I fix this, btw? I've already cleared my cookies.