I've just upgraded from 2.3.3 to 2.5.1 using the automated upgrade plug-in. Everything ran smooth, but if I now want to see a single post, i get an enormous page with all these other pages (actually, I believe they are my pages, from new till old) that it crashes my firefox.
I've turned off all my plug-ins and changed the theme, but the same thing keeps occurring, so I fear it is something in the wordpress engine? Also downgrading to 2.5 didn't change anything.
What can I do?