In the backend, I edited some text with an link (a href="..."). When I switch to the HTML view of the content, I can confirm, that it's correct.
After saving, it seems that Typo3 saves that link as an tag but don't parse it back.
I tried things like (in TypoScript):
page.10.marks.CONTENT.select.where = colPos=1
page.10.marks.CONTENT.wrap = <div class="main_content">|</div>
page.10.marks.CONTENT.parseFunc.tags.link < lib.parseFunc.tags.link
or
page.10.marks.CONTENT.parseFunc =< lib.parseFunc_RTE
But nothing works... I'm not able to find a working solution for Typo3 >6.0. Hope someone can help me with that issue.