EN8 will need to be updated for macOS compatibility in the near future

Besides gradually slowing to a crawl (reported many times to tech support-it always gets attributed to macOS), the latest seed of macOS 10.13.4 displays this on opening (see attached image). Maybe that will also remedy some of the massive slowdown issues??? As reported, EN8 gradually becomes a showcase for spinning balls with every click, and that makes it unusable for any prolonged work.