For the record, I'm having the same problem with current software and firmware. I found
the following on Logitech's support forum:
After over a month and many calls to level 2 support I finally
have a fix for this. Call Harmony support and get to level 2. Then
tell the tech that the solution is written up in Case #070416-002382.
The tech that finally fixed things was George.
The
fix is adding a piece of code to any activity wher you want the
greenbutton to work. If you chance your activities again, they will
stop working as a media center activity and you'll need to call again.
So get things setup exactly as you want, then call support.
This was posted 06-15-2007. Not a perfect solution by any means, but a workaround, nonetheless.
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