Thanks Arodi007.
Timeline is setup for 1 second, but I play w/ the Play Rate (= speed/spline length) so the wall time is different. I’ll play with that. The only function I call in the Update is to a meta sound to change a parameter (i.e. change the frequency and loudness of the marble rolling which depends on the speed of the marble). I also call a macro that calculates the final speed, reversing boolean and falling off boolean. Everything else is directly off the Update pin of the timeline.
thanks for the confirmation that this ‘infinite loop detected’ may have nothing to do with an infinite loop.