That´s not a problem of Classilla, it also heappened with Mozilla 1.2.1 (the latest official release) and with WamCom (Mozilla 1.3.1 based). It´s that ugly phpBB and occured with the change to phpBB 3.0 at many forums. I was always wondering why even 68kmla didn´t use a style which is usabele at most recent OS9 Browsers (Opera 6.0.3 also can´t display it correctly), ...
But back to Classilla; it´s a great step foreward! Many sides are rendered better and faster than with WamCom! For people like me who are only using MacOS 9 it´s a great help. About the people who are able to code around here, help them going on with developement.