TYPO3 Core

In:

/<your-site>/typo3/ext/rtehtmlarea/mod3/browse_links.php

Replace:

setClass(document.ltargetform.anchor_class.value);

by:

if (document.ltargetform.anchor_class) setClass(document.ltargetform.anchor_class.value);

in lines:

901, 908, 914, 920

This solves links to pages, files, external urls and email addresses.

obottek@feas.net, www.feas.net