Same issue here.
Android tablet black and white, using App (Samsung TAB A7 505) and Dell 2 in 1 5480, fully updated.
HTML5 version working fine, full color even at this same tablet, with Chrome. But its slower than app, so not a good workaround.
I´m using Windows 10, updated to last server version 1.0.50 after this bug, reinstalled everything on Dell notebook and Samsung tablet. Cleared settings. Restarted everything. Still Black and White.