My b2evolution Version: 2.x

I'm using firefox 3 beta 4 (which may be my problem to begin with) and evolution v2.4.1

Whenever I log into backoffice from firefox the css style sheets will not load, I have to go in and manually load the style sheets for each page in the backoffice otherwise all I get is a text outline. Does anyone have any ideas how to fix this? Is this a known incompatibility issue with firefox 3? It seems to work fine in IE :(

Thanks,
Dave