cfform will not display on OSX (CF10 on IIS 7.5)

Recently, we upgraded our webserver to IIS 7.5 and ColdFusion to CF10, and ever since then any forms I have which use CFFORM (not flash) will not load on any Macs, with any browsers.  I've noticed that these same sites, when running on a Windows 2003 Server (also running CF10) do show up on all browsers in apple machines.

Before I convert all of these cfforms to regular forms, can anyone help me with this?  I suspect it must be a setting on IIS 7.5 that needs tweaking, but as far as I can tell all of my filters and and settings are correct.  And yes, everything works fine on PCs.  Any ideas?