Cutting the pads apart then requires that you power the Teensy from a separate (not USB) supply. The idea is to allow you to have USB connectivity while powering the board separately using Vin without the problems of...
Hi Cliff, where do you declare chipSelect? It should be declared in the first part of your program before anything that needs it. If that is not it, post a more complete example of your code so that we can better...
I had a similar problem with my Teensy 4.1 and Adafruit HX8357 display. It went to inverse colors and a mirrored image. It turned out to be a loose connection. I reseated the connectors and the problem went away.
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