<img src="https://dl.dropboxusercontent.com/u/3594143/yal.cc/14-02/cap/c2search.png" border="0" />
Self-descriptive: if your nickname is too long (like mine), two problems appear:
1. Nickname gets cut off, breaking the visuals.
2. Small arrow overflows to the next line, making "Forums" and "New posts" buttons semi-unclickable (since username DIV becomes larger), and leaving you only few pixels to click on the search field.