Missing styling on the link in 2.0.18 (Code inside)*
This discussion is related to the Participated Discussions addon.
The "Participated Discussions" link on the main page has a different style than the links beside it. To fix, add "TabLink" to line 96 in class.participated.plugin.php:
echo 'RequestMethod == 'participated') ? ' class="Active"' : '').'>'.Anchor($MyParticipated, '/discussions/participated', 'MyParticipated TabLink').'';