Greetings.
I am writing in response to an unanswered question on the Discussion page of the Header Tabs extension page here: http://www.mediawiki.org/wiki/Extension_talk:Header_Tabs#switchtablink_parse...
This issue exists on my installation as well and I am hoping that I might get some developer insight as to why this is occurring and, barring that, at least ensure that you are all aware of the issue.
My installation:
Mediawiki Version 1.18.1 Header Tabs Version 0.9 Semantic Mediawiki 1.7.0.2 Semantic Drilldown 1.1 Semantic Forms 2.3.2 Semantic Results 1.7.1 ParserFunctions 1.4.0
Skin: GuMadDD
Regards.