Hi Jared
The .DLL is specific to RoboHelp, not IE. One has to
specifically register the DLL and there is nothing to my knowledge
that an IE upgrade or downgrade would do to change that.
My thought here is that where things are functioning, the PC
has had the DLL registered properly in the past. Where it isnt'
working, the DLL has never been registered. Maybe it was a new PC
or one that had the drive formatted and Windows reinstalled. Or
even Windows rolled back to a restore point prior to having the DLL
registered.
Cheers... Rick