George,

You are describing a 'cookie' problem. Your browser only displays new posts IF it's cookie archive is updating properly.
I have no clue what exactly is happening, but it seems to center around your browser. You can clear ALL cookies from your browser (dont' do that!) or you can go in and delete the cookie(s) that are for Crossfireforum only.

I've had to do this maybe five times in ten years, it seems to happen more on thespaceport and facebook than here.