Ok, I think I now know what my problem is:
It seem's like the filenames changed during a version upgrade.
As i use DSLocaleSelector in an skin and it is hard coded in the register section of the page (<%@ Register TagPrefix="ds" TagName="LANGUAGE" Src="~/DesktopModules/Delisoft.DSLocalizator/DSLocaleSelector.ascx" %>), i refered to the old file which still existed fro any reason.

But changing that by pointing to the DSLocaleSelectorPA now I ran in the next problem:
Before i displayed a flag with the text in the link to switch language (<ds:language id="DSLocaleSelectorPA" linkcssclass="MenuItem" linktemplate="<span class="[CssClass]"><a href="[URL]" _fcksavedurl=""[URL]"" title="[ChangeLocaleText]">[LocaleLanguageName] <img src="[ModuleFolder]/images/flag_small/[CountryCode].png" alt="[DisplayName]" align="middle" border="0"> </a></span>" displaycontrol="links" runat="server"></ds:language>), now it is shown as the dropdown again.

Did the interface change as well?
Configuration section of module doesn't reflect any changes!

Günter