When updating to XTmembers v2.0.1 stable and memberlist v1.0.4 stable, the Install routine attempts to execute this code:
ALTER TABLE `tl_member` DROP INDEX `autologin`, ADD UNIQUE KEY `autologin` (`autologin`);
and it doesn’t work and keeps returning you to the same screen. Logging off and back on returns to this screen. If you cancel then it goes away.
This from the Contao developer’s help forum, reprinted in English for all you who don’t speak German 🙂
Even though the Install Tool indicates otherwise, the index is created and works properly. So there is no issue. Ignore it.
Note: Do not try to remove or change the index yourself!