Permission Denied in IE after 2.7.0 upgrade

We recently upgraded from GWT 2.5.0 to 2.7.0 and since the upgrade our app no longer works in IE 8/9/10. The error we're getting is...

SCRIPT70: Permission denied
orderentry.nocache.js, line 4 character 123

And that line happens to be:

u=a.contentDocument;

For a little background our app is hosted in an iframe within an HTML page that is served up from a domain like star.mc.company.com. Our content is served up from voom.mc.company.com and in our host page for our GWT app we set the document.domain to "mc.company.com". This approach worked on IE 8/9/10 and Chrome prior to the upgrade to 2.7.0.

The issue sounds similar to https://github.com/gwtproject/gwt/issues/8794 but the work-around suggested there didn't change anything.

Anyone else experience this? Anyone have any suggestions?

Thanks,

Norm

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