I have been using wordpress for about a month now and everything was fine. I was using the date style permalink.
Today I was reading my blog, and was able to click on any link to other pages, archives, categories and so on and it worked fine. Then all of a sudden, I went to click on another link, and it came back saying "404 page not found".
I tested that for every single internal link on ym blog and they all disappeared. I changed the permalink option back to the default /?p=.... and everything works. I changed it back to the date style, and they don't work.
The .htaccess file is there also and has not been touched.
How could that have just happened on its own, without me changing a single setting at all. Fine one second, gone the next?!