.chm file's home page ok at init, but not if accessed via Home button...

I am running TCS3 (FM to RH) on an XP machine and a Win7 machine. The file sets are nearly identical, except that the names are incremented numerically for version number (e.g., NAME_3-XTCSR-CVR.fm (XP) versus NAME_4-XR-CVR.fm (Win7)).

I have ensured that each of the help systems generates/works as intended on each system, but there is one stubborn issue with .chm files generated on the Win7 machine. When I generate a .chm on the Win7 machine, despite that the (HTML Help Options - Microsoft HTML Help) "Default Topic" and the (Window Properties (HTML Help) | Advanced Properties | Destinations) "Home" point to the same file, the only time the "home" page will display is when the .chm initially loads. Thereafter, whenever I press the "Home" button, I receive the "informational" message "This program cannot display the webpage". Again, this only occurs on the Win7 machine, and only in .chm help.

A "Properties" check of the initial "home" page yields:

mk:@MSITStore:C:\Users\beh\Documents\My%20RoboHelp%20Projects\NAME%204X%20On-Line%20Help\!SSL!\Microsoft_HTML_Help\NAME_4.0_Desktop_Help.chm::/NAME_4-XR/NAME_4-XR-CVR/NAME_4-X-CVR_Page_1.png

A "Properties" check of the failed "Home"-button-called "home" page yields:

res://ieframe.dll/dnserrordiagoff_webOC.htm#mk:@MSITStore:C:\Users\beh\Documents\My%20RoboHelp%20Projects\NAME%204X%20On-Line%20Help\!SSL!\Microsoft_HTML_Help\NAME_4.0_Desktop_Help.chm::/

Any help will be very much appreciated. I have exhaustively checked the configurations, and other types of help generate systems as intended.

Thanks!