The search text is not supposed to display. I'll fix that. Bloody idiot browsers that can't read basic css.
ETA: Fel, the fix is to edit the value for the submit in index.template.php. Change ',$txt['search'],' to and change the css to this:
#upper_section div.news form#search_form input.button_submit
padding: 0 10px;
The same fix should sort any other variants.
Tormod: that's an RC2 bug, not a PortaMx bug.