Last night I decided I wanted to replace Feedburner Feed Replacement plugin with the offical Feedburner Feedsmith, but something went wrong. I think while cleaning .htaccess file I accidentally removed a line too much and my permalinks stopped working.
I quickly copied the correct .htacceess file (less the old feedburner feed replacement lines), but it still doesn't work and now instead of nice and clear permalinks (/%year%/%monthnum%/%postname%/) like I used to have, I'm stuck with /index.php/%year%/%monthnum%/%postname%/
Worse, even if I completely clear .htaccess and try to start from scratch, my WordPress doesn't overwrite it. Apache and mod_rewrite shouldn't be a problem, cause (1) I had a working version of permalinks only yesterday and (2) I have another WordPress install on this server and it works with permalinks (though I didn't replace old feedburner plugin with Feedsmith).
Anyone can save me?