I found that in the last tab. Not only did it NOT hide the numbers, but now my buffs are gone :o
I have:
Hide Auto Powers: Disabled
Blink Near Expiration: Enabled
Icon Stacking: Default Stacking
Hide Buff Numbers: Enabled
Stop Sending All Buffs: Enabled
I tried /reloadgfx
I tried rezoning.
I tried with different characters.
I tried revalidating files.
I tried restarting.
I think I just found another grey hair :-[