I have help system that is generated from RH7 in WebHelp output, and then launched from a .NET application using standard F1 or menu commands.
One user (on XP) gets an Internet Explorer Script Error when launching the help from the application. It is not consistently repeatable for that user, and I have been unable to reproduce it on my own system, but I have seen it and confirmed that it is occuring on the user's system.
A screenshot of the error is attached.
If it helps any, it looks like the error is in the tocExpandHelpSet function in the whthost.js file.
If anyone has any insight into what might be causing this, let me know.