WowAce

Shouldn't EnhanceBackdrop remove the frame's existing backdrop? The EnableEnhancements method does this, but it doesn't look like it's intended that I should need to call EnableEnhancements immediately after EnhanceBackdrop. If the frame's existing backdrop isn't removed, then any backdrop set after enhancement isn't visible (unless the existing backdrop was partially or completely transparent), so it seems like it should just be removed automatically. You could even reapply the previous backdrop after enhancement using the new methods if you wanted, though it seems like anyone using the lib probably intends to set a new backdrop anyway.

Edit:
If you're short on time, I can commit the change myself, just let me know.

go for it

Committed.