Hi Sami,
thank you for your quick reply.
I downloaded the latest version today directly after release and worked directly on changing the permalinks. First I liked the plugin because it does exactly what I need to do except for the error of course.
After I realized that the pages have 404 errors and are gone I tried to change everything back until I deactivated everything. Only 2 of the pages (from only 5-7) still have the error. There is nothing different than on the other sites.
What also occured after installing and deactivating, that I couldn’t change permalinks on the default WP setting page to another setting. the only setting that works now is page_id.
Please let me know what you need to know to help me.
Thanks,
Adrienne