I made a widget area and put it in the center column above the loop.

In Firefox, the text wraps around the widget (which I want), but in IE, it behaves as if I'm adding an entire sidebar, and text does not wrap.

Any ideas on how to make it behave in IE?

Just the placement of the widget area with the php code in the center column (i.e., with no widget in it) makes this behavior happen, so it's not the contents of the widget.

Just putting the php code for the widget area should do nothing. What is the code you are using and where in the above the loop box are you putting it?

I'm using the simplest form of the php <?php bfa_widget_area('name=SignUpButton'); ?> and putting it in Style & edit CENTER COLUMN / Content ABOVE the LOOP.

Could you supply a link to the site?

What looks like an empty RH sidebar in IE is what this widget area does (in FF the text wraps like I want). The SignUpButton widget has no content in it.

I don't think your float right for the widget area is going to work for IE.