SOLVED ONLY works with cable plugged into input jack.

[Mr. Strypes]

This is a weird one, and I can't find the information I'm looking for anywhere. I built an Oasis (Dunes) pedal. It only turns on when it's plugged into my 1 Spot Current Reader/Cable Tester. I put it on my board, which uses isolated power (Truetone 1 SPOT PRO CS12 12-output Isolated Guitar Pedal Power Supply), and it didn't power up. Then I tried it by itself using a 1 Spot 9v. Still, it didnt power up. I put it back on the 1 Spot Current Reader/Cable Tester, and voila, like magic, it turns on.
One more quirk: It only works if a cable is plugged into the input jack. (Of course, I did this with my other experiments, but it only powered up with the 1 Spot Cable Tester/Current Reader.)

 

[music6000]

I have never had an issue as I've only used the 1/2'' or 12mm 5.5 x 2.1 style below:

 

[jimilee]

I started getting all of my parts from @StompBoxParts a good while back. Very quick shipping and very trustworthy. Not going back to Tayda.