Yes I have one and it doesn't work on my modded Duo-RX, or my modded CoreGrafx. It sucks.
Sorry to hear about the problem.
If you got an early TED v2, a version 2.1 or 2.2, then you can return it for replacement, and that
may fix your problem (v2.1 and v2.2 had a problem with their startup code).
If you've got a TED v2.3 or v2.4, then they work fine, but they're sensitive to the effects of some/most region-mods, especially if the region-mod isn't switching fast-enough.
That seems to be fixable by making sure that the region-mod is getting a high-voltage power source.