I have the 300, regular, 700 and 900 weights of Roboto loaded via the fonts panel but they aren't showing "available" or white in the selector. However, if I select them they do seem to work.
Tried a few different fonts and it seems like the issue is sort of random on which weights it's taking.
@cyberdave I also noticed that letter spacing won't go negative anymore. It's impacting all sites...or at least mine.