Fixes from Boris from the forums:
The first bug is located in include/plugin_internal.inc.php:
in the long switch-statement is a duplicate Entry for show_atom0.3 and none for show_atom1.0 with the result, that there's no Atom 1.0-Option in the configuration.
Second: The function serendipity_makeFilename in include/functions_permalinks.inc.php is not utf-8 ready. I always helped myself converting it manually in 0.8x, but now s9y supports utf-8 this function should do this too. Smile
If not, all those special chars are not converted, but striped from the URLs.