Erode, Blend, and possibly other brushes are not properly undo-ing. Sniper sends the message of blocks undone but the actual blocks are not replaced.

How about giving some more information?
Version for example.

Hmm, not sure then. But he did show me blend ball not working, maybe erosion screwed up his undo, which made all brushes after it fail?

Its the same as main server :P and i did this when i went to bed, appleassult told me before i went so figured i do this before i forget

Yea.
I confirmed it for the erosion brush.
Probably because of some inconsistency of the erosion brush.
Although I couldn't confirm it for Blend Ball.

I'm going to rewrite the erosion brush with better performance and structure.

Probably. I just know undoing blend works just fine.

Gonna commit it later. It's fixed.