I am having a problem that seems to be a combination of other people's problems, but nothing seems to work. My blog is three weeks old and everything was fine until today. Today, although I changed nothing, I started getting 404's on every page, including the home page. I read somewhere to change to default permalink structure, so I did. After that, the home page would work, but no permalinks (posts, tags, categories, anything) would work; they all just took me back to the home page.
I have tried writing new posts with various permalink structures (including default) and I have the same issue.
My .httaccess file is as it should be, based on other posts.
I have turned off all plug-ins.
I don't think it is an issue on my host's side (although I am no expert there).
I am very frustrated and have absolutely no idea what to do next...
Please, please help me...