RH10 and Windows 8 Bug with DHTML

I reported the following bug today:

Concise problem statement:

All DHTML effects in WebHelp—with the sole exception of drop-down and expanding hotspots—fail to execute on CLEAN Windows 8 systems (upgraded Windows 8 systems from Windows 7 do not seem to be affected), regardless of default browser.

Steps to reproduce bug:

1. Set up any DHTML effect other than drop-down or expanding.
2. Save topic and click “View Selected Item”.
3. The following script error is thrown: “Unable to get property ‘alpha’ of undefined or null reference” — the error points to the ehlpdhtm.js file (in my case, line 4233, char 2).

Results: No DHTML in the WebHelp output execute, with the exception of drop-down and expanding text.

Expected results: DHTML displays as developed (and yes, "Update DHTML effects in topics" was run). It is important to note that all these effects display as expected when run from a Windows 7 machine.

I noticed this after being forced to format and reinstall my system drive, on which I'd previously done an in-place upgrade to Windows 8. There was no issue unitl I'd done a clean install of the OS, implying that something carried over from the Windows 7 setup to prevent the error.

I've tested this against IE10, Firefox, and Chrome with the same results: DHTML effects (such as Fly-in) don't work and, worse, whatever the effect is attached to does not display.

If anyone else is having this issue, it would be good to report it. If anyone has a possible fix or workaround, I'll be glad to be a test monkey.

Thanks!