Dropped items disappear

[seajay1221]

Title: Dropped items disappear

Version: 3.1.2

OS: Linux

Java Version: 1.7

Description of Problem:

So, my tekkit server has taken on a weird aspect. Nearly all items dropped disappear immediately. Mining will result in what seems like 1/5 yield, although it's tough to tell. Like, breaking 5 stone will give you 1 cobble. Thrown or dropped items disappear. It looks like they're just flying away behind the players who drop them.

Any thoughts? It's kind of a dealbreaker. I've disabled all non-tekkit bukkit plugins and restarted a few times.

EDIT

Stuff I've tried:

Downloading SMP world to Tekkit SSP. Gave Tekkit less RAM than my server has. Worked fine. Reuploaded to server with a bunch of items still on the ground. They were gone when I logged in.

Reinstalled Tekkit plugins and jar file. No change.

Rolled back the server to a time when there was a known-good. No change.

Tried in Overworld/Nether/End. No change.

I'm totally at a loss. It's not RAM, it's not the world, and it's not Tekkit. Where does that leave me?

Error Messages:

Error Log:

[iamthepiguy]

I've worked out what it is! It means you have an activated Black Hole Band in your inventory or in an Alchemy Bag you're carrying. It's activated if it's purple.

[CoderJ]

Any chance you're using NoLagg? The distributed tekkit.jar or have you switched to CB++ or something else?

If you're using NoLagg, don't. Either turn off everything in it or find an alternative. Most (but not all) server ops have had issues with NoLagg