Failure to launch, v3.19.10 on iOS 13.4.1 – Prisma: Photo Editor, Filters Review

Have enjoyed the app for a year or so, but performance has steadily declined, and this latest version will not launch at all. I have closed all other apps & restarted my mobile device, but even following this sequence of events Prisma shows only a white screen with the black triangular logo before shutting down entirely. The Prisma app icon is the equivalent of a digital paperweight on my iPhone XS Max screen.
Review by LonghornInAustin on Prisma: Photo Editor, Filters.