Preview function popup not working in IE

Preview function popup not working in IE

Hi, I am having an issue where the popup window from my custom action preview function is not appearing correctly in Internet Explorer.  I have version 9 and others have reported it in versions before 9.  The address is https://creator.zoho.com/slaafws/registration/#View:SLAA_Intergroup_Listings on click of the blue "More Information" buttons.  One time you click the button the window might appear, then the next, it doesn't appear,  and shows only a transparent gray band at the very top of the page.

The first screenshot is the popup failing.  The second is after about 20 clicks, I got one to appear.





Your help is appreciated.
Beth