Not consistently reproducable, but regularly happens in multiplayer. Updating with the wand shows accurate values. My guess is the client and server not syncing correctly.

http://imgur.com/a/hdxve

First image is the error where the spreaders default to facing east(?) and the pool appears empty.

Hm does this only happen when coming back to an area, or just randomly when you're standing? There?

I've never noticed it while I just stand around, it's always when I come back to the area. I'm never going too far (it never unloads), but I do leave the chunk.

This has been happening to me too. Sometimes even right when I'm looking at it. It always seems to accompany a nearby tree growing, for me.

huh, this seems to be closely related to #71, which happened to me on a test server in the proximity of nearby trees.

Not sure what trees are doing to mana pools, but will investigate

It would appear to be trees. My tree farm right next door seems to be the culprit.

http://imgur.com/a/FDqyk

Yup.

The reason is that when a large amount of blocks changes, mc sends a different packet to the client. Due to a quirk and the TE being eager to refresh, it wipes on the client until the server resyncs.

Trivial cause for one of the biggest headaches of this port (#71) lol