Glad you got it going! Spending hours hunched over a cab troubleshooting something can be maddening! I think you are right that my problem is still something in my cabinet.xml file. I switches LED strips and the second strip works fine in the first strip’s position. Maybe I’ll try adding the second strip to another port on the teensy instead of daisy chaining the two.
I did, however, receive this and got it going 
Need to figure out a decent mounting setup to my DMD grill.
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