The pop up window for control properties does not open when using firefox and clicking the radio buttin or check box buttons.  Tried it with doctypes html4.0 & xhtml1.0.  Same problem on CE site demo page (used default configuration link).  Using FF 1.5.

Also, once the check box or radio button are in the editor, in FF I can't access the properties by doulble clicking or by right clicking.

P.S.  Safari & Opera support are nice, but IE & FF are critical.  I think FF support has crossed the line from nice to required.