Thanks for the fix - I'm running in VMWare Fusion on my MacBook Pro. Turning off the 3D acceleration feature in VMWare fixed the issue. Interestingly, bumping it up from 1GB to 2GB dedicated of virtual GPU RAM didn't make a difference, but flipping the acceleration off completely solved it.
I don't have a lot of objects (>20), but I did have a somewhat(?) large layout - apx 10,000x10,000 pixels. Not much in the way of event sheets either - maybe 30-40 events total. The layout has three tiled objects on different layers for parallax, but that's about it.
I guess from a trouble-shooting perspective, it would be cool if the editor would report an error if the GPU acceleration bonks out, or maybe falls back to non-GPU if GPU fails. Of course, if I'm in feature-ask mode I'll just ask for a Mac native Construct 3.
Thank you so much for the quick response!