That breaks Geko-based browsers. IE does not draw floats according to the standard. The "fix" you found is just a use of the IE float bug (in fact, I used some CSS IE hacks to get IE to use that bug for IE display only). Grab Firefox (Geko-based) and Opera (non-Geko) in addition to IE and see if you can get all three to work. Geko-based browsers (Mozilla, Netscape, Firefox, Camino, etc.) have higher priority than Opera.
Ah. This would explain why the "members main" page has been causing my browser to crash for the last several days. The current version doesn't. I hope it won't start again.