Enigma --> Pitchblack = super weird problem

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So here's the story. I've been wiring up a new pedalboard configuration, making some new cables. Every time I'd make a cable, I'd check to see if it worked by using it to plug my bass into my pitchblack, on my workbench. Everything checked out, so I wire up the board and fire it up. Because my amp is on the other side of the room, I put the pitchblack last in the signal chain, again to check whether I'm getting a signal through the new cables. No signal.

Perplexed, I start taking everything apart and rechecking cables. They all work. After a bunch of detective work, I make a very peculiar discovery: when the pitchblack comes after my EHX Enigma, it won't work--powers up, but doesn't detect any pitches whatsoever. At all. Not even via the Enigma's dry out. Not when the Enigma is on or off in any configuration. Before the Enigma, it works fine. If I run the pedalboard into my amp without the tuner behind the Enigma, everything is hunky-dory.

Now this is not a real serious worry for me, as I'd planned on putting the pitchblack at the beginning of the signal chain anyway, where it works. But I figured I'd bring it up for two reasons:

(1) It's a seriously weird problem, and I have no idea what on earth could cause it. How could the Enigma be sending a signal through it (as I know it is, since I can hear said signal through an amp) but that signal isn't triggering the tuner? Any ideas on that would be interesting.

(2) If it's a problem that generalizes, instead of just a bizarre pedal or two I've got, if anybody plans on putting a tuner after their Enigma, they might want to think twice.