Using: Firefox 3.5 or 3.6, verified on Win 7 and Fedora 11/12
I don't know if this happens in other browsers, someone with IE could check that.
If the section names in the toolbar don't all fit on one line, the ones that wrap around overflow off the background and float on top of the text in the input area. The same is true for a section with buttons, if the buttons don't all fit on one line.
To see it in action, go to el.wiktionary.org to edit a page; select 'Τοπικά' which has plenty of buttons, then shrink the window. You can also simply shrink the window before clicking anything on the toolbar and watch the section name behavior.
Version: unspecified
Severity: normal