@weltandrei
1) osclass by default mark category that does not contains any listing as error 404
2) that's problem of osclass core scritps
3) in theme settings
4) What you mean?
@MB Themes
i will try to resolve the first 3.
For the fourth i have on the upper left corner the information dropdown menu and the links inside the menu don't have anchor text, here is the table with the pages that are missing anchor text.
<a href> [no anchor text, probably image] /agb-p34
<a href> [no anchor text, probably image] /datenschutzerklarung-p35
<a href> [no anchor text, probably image] /benutzer/neue-benutzer-registriren
<a href> [no anchor text, probably image] /contact
<a href> [no anchor text, probably image] /anzeige/neue-anzeige-angeben