[DLCPhoto]

I appreciate the replies.

No dialer replacements.

A hard reset is always an option, but it would be extremely time consuming re-installing and reconfiguring everything trying to pinpoint which app might have caused the change.

And whatever Cab might have caused the problem presumably did so because it changed one or more registry settings, so it makes more sense to just identify what the correct settings should be, and just directly edit those to get things working correctly again.

So the question remains - does anybody know which Registry keys govern the backlight turning on/off and the proximity sensor function, when making a call, and what the default values are?

There should be a Master List of Registry Keys, the functions they govern, and the default values, for WM!!