This latest update has semi-bricked my 2016 Roku Ultra. It's only displaying at 1080p, auto resolution is not working, but even worse, it cannot find any sync at all about half the time, so just a black screen. Absolutely zero problems with 4K prior to this update.
5.2.4: JVC RS540 | Stewart Greyhawk 120” 2.35 | AudioControl AVR-9 | Oppo 203 | TV 4K | Xbox One X | Roku Ultra | Triad Rackamp 700 | Gold/6 LCR | Silver surrounds & heights | Bronze/6 subs
5.1: Sony 940E | AudioControl AVR-7 | TV 4K | Xbox One X | Roku Ultra | Tivo Roamio OTA | Triad Rackamp 300 | Bronze/4 LCRS | Bronze/4 sub