I can't figure out why my login page disappeared. I already tried to reload the following files:

/includes/modules/pages/login/*.*
/includes/modules/pages/create_account/*.*

/includes/languages/english/login.php
/includes/languages/english/create_account.php

...but it didn't help. Is there some other way to get back my login page? All the other things after upgrade work excellent.
My URL is http://www.kreizy.eu/index.php?main_...2a&language=en

Thanks a lot for your help!
Jurga