Good to know -- glad it doesn't crash but it's probably good that we delete it if it is invalid so that work is not wasted on trying to render it. What happens if you choose a non-software GL renderer? Do your waveforms work? Maybe we should make spinny's work more like the waveforms that have a holder widget and a software vs. GL implementation so that spinny's could work when OpenGL is not supported. On Tue, Apr 9, 2013 at 11:58 AM, ewan colsell