I have ugraded to SS 2.4.2 and after that to 2.4.3. Both versions require the index.php file in the nested url's. This doesn't look as nice as it used to and it prevent sharethis module from working properly. Can't find anything about this changes in the change log. Is there any addition to the configuration I may set up to prevent this?
Thanks for your answer Willr!
The htaccess file was blank. I fixed it by copying the content of a htaccess file from a working SS installation to this installation. But how could this happen? I was supriesed that I did not get the warnings I used to do in the insatllationprocess earlier. Like for example the htaccess-file does not have write permission. So maybe the installer wasn't able to write this the file...?