Problems with Permalinks after Upgrade

Hey there,

after upgrading to WordPress 3.5.2 my permalinks are not working. The code is showing the right links, but when clickling the links, /tag/, /page/, /category/ .. is removed, but posts are displayed properly.

Chaning the permalinks to “default” makes the URLs work, but I want to use “Month and name” as my Permalink structure.

What I have done so far is rewriting the .htaccess, changing the got_mod_rewrite() function to

function got_mod_rewrite() {
	//$got_rewrite = apache_mod_loaded('mod_rewrite', true); //old line with false negative;
	$got_rewrite = true;//force the response to true as we know mod_rewite is installed;
	return apply_filters('got_rewrite', $got_rewrite);
}

Do you have any ideas how to solve it? For me it’s very important to have a running Permalink-structure.

Here is an example of what is happening:
blog/tag/china leads to /blogchina/

Thank’s so much for help!