Strange Lag Issue

[Dyspareunia]

Title: Strange Lag Issue

Version: 1_0_3

OS: Debian GNU/Linux 6.0.7 (squeeze)

Java Version: Java SE Runtime Environment (build 1.7.0_25-b15)

Description of Problem:

Greetings!

I've just recently created a new Tekkit Frontiers server and am loving it so far!

I have pretty much everything up and going nicely, however I am having a rather strange lag issue and am curious if anyone else has encountered it, if so... is there a fix?

The server is virtually lag free, power runs smoothly, items drop cleanly. However, whenever I try to craft something, for example a furnace I get this weird item lag. When I place the cobblestone for the furnace in the crafting grid, the items flicker, sometimes disappear even tho they are still technically there. If I hold down the mouse and drag the cobblestone into it's pattern, it happens smoothly and quickly?

I've tried removing ALL the plugins to see if this helped, it did not...

Server is running on a gigabit line (A server, not some home PC), not maxing the CPU or RAM.

Any thoughts?

Error Messages:

None

Error Log:

N/A