When loading a pre-existing contact sheet with above ~2500 images (most of mine are ~3200-4000 photos), I like to be able to filter just my tagged photos, but if I touch or click within PM5 for about 20 minutes after selecting "tagged" in the selection dropdown menu, then PM5 crashes and cannot recover. It's worth noting that this issue doesn't occur on contact sheets that PM5 has created in the same session (say, if I import photos into a destination, then PM5 won't crash).
I'm using Windows 10 Version 1803, build 17134.191. One of my computers is a Dell XPS 13 9360 (Intel Core i5-8550U, 8GB RAM, Intel HD 620 graphics), and the other one is a custom built desktop workstation (Intel Core i7-6850K@stock frequencies), 32GB RAM, Nvidia Quadro K4000, Nvidia Tesla K20), and I'm running Photo Mechanic Version 5.0, build 19695. I save to external drives (most of the time, a Seagate BUP Slim 2TB over USB3.0)