Not resolved, as I thought. Have tried a couple different resistors in different configurations on the clock, latch, and data wires.
Also, can’t get my button to work. One leg of the momentary button is on the 3.3v and the other leg is on pin 11. My RPi is a revision 2 but looking at pinouts has them named the same on both revisions. SNESDev is set to poll pads and buttons.