CustomPainter not working?

[sqcsabbey]

I have a CustomPainter over the map in a Stack, and this CustomPainter was working with the old plugin, but with this plugin my CustomPainter.paint method gets called endlessly without any screen changes or shouldRepaint being called; why would that be, and how do I fix it?

Btw, I also cross-posted this at StackOverflow, but I suspect the issue is specific to this plugin...