Here's an oddity I have been seeing for a few years:
If I enable short Spider Friendly url's with or without "fake" html extensions, clicking any topic or catagory takes me to the main page and never the topic...
This started after a few years of trouble free operation. I notice checking "Spider Compatibility Mode" fixes it. But I wonder what changed after a few years? It has to be a host issue and I notice my new host acts the same.
I know all this is basically obsolete stuff, but interesting never-the-less
