Tech Note: ASV requires Flash active-x(IE) plug-in installed to display preview/Flash content.
Active-x Flash plug-in, AKA the IE plug-in, is not used exclusively by IE. It's an active-x control which is used by many applications.
ASV uses the control to display Flash content in the preview window.
We have recently realized that the check we had for it fails and in case you don't have the IE plug-in installed (and people don't use IE much and so won't install the plug-in), you will get cryptic error messages beginning with a 'Class not registered' one, when you try to open the preview window [This applies to ASV 2012/10 and below].
Solution is easy, install the IE plug-in, it's not for IE only. (ASV will display a much better error message with the next update).