Is this resolved ?
Wondering if it was the batts or the placement of the ridge inside the machine..
Yes and no.
Yes, in that I know the cause: The bottom post in the switch needs to be pushed out a bit to make good contact with the purple batteries. This is an issue that affects only my switch (as far as we know now). It was one of the very first mechanical switches out for the Protege. Other [later] Protege switches seem to work fine with the purple batteries. That's why we had such a hard time diagnosing the problem initially.
No, in that I'm going to wait until my V1.1 arrives and then send it in for a tune-up from the professionals and maybe a switch upgrade if they're available. It's currently working fine with the blue batteries, and I ran out of patience trying shims of various widths to get the perfect fit. And I don't want to live without it until I have another to use in its place.