Script Errors on Web Page (only when viewed from RDM)

At work I have some NAS devices that use an HTML page for administration purposes. I had these in RDM for the past couple of week and it was working fine. However today I upgraded the firmware on the NAS and now I'm getting script errors (in the form of a "Script Error" pop-up dialog) when I visit the page from within RDM ...but not when using IE natively.
I've confirmed using F12 developer tools that the same script error is happening when running IE natively, but it does not show the pop-up. (I guess it silently errors)
So it seems like RDM isn't honoring all of the IE settings for some reason? Anything I can do about this?


I've tried to enable the "force 32-bit" option but get the same results.


Windows 7
IE 11
RDM Web Session with "Embedded (tabbed)" display type.