Mavexplorer hangs when data brushing (eg Innov NE vs map)

I am using Mavexplorer to analyse logs from flights with my fixed wing model.
It works well except for data brushing - eg. selecting a portion of, say, innovations NE graph and using the up/down/left/right icon to slide graph with aircraft track plot on MavFlightView map changing concomitantly. I am running Mavexplorer on Python 3.11.4 on Mac OS X 11.7.8 (ie. BSD unix I think). Perhaps there’s a way to tell python to allocate more memory resources or some other fix to try?