So not sure if anyone else is having this, but in Character screen/Inventory - sorting/filtering the contents is working fine, all the new filters are there (rarity etc) and works great...but at all the vendors I've tested (still Act 1, tested on Volo and dude at Grove and Grymforge guy till he bolted the city) it's all over the show, Equipment filter leaves just torches (no weapons showing at all, yet the weight shows), those new filter options aren't showing either (not sure if they're supposed at vendors? can anyone confirm? aka Rare, Legendary etc).
Verified all Steam files so not something missing, and rolled back to a save wayyyyy back (i'm at 50 hours now, went to 20 hours still the same) - it def wasn't happening then so something's changed the game overall it feels like (patch 2 is when I noticed it).
May do a full re-install see if that fixes it, but figure I'll see if it's universal first!