After the blocks formed the Arc Furnace it kicked me out of the server and keeps doing it whenever I rejoined.

Server log: fml-server-3.txt

Will look at it when I have some time.

Can you try and use build 141?
If it spams some log lines along the lines of "Error: Block at <coords & info> returned null after indicating the capability is available.", post those here.
They'll hopefully tell me who/what to yell at.

Looks like it's fixed, thanks.

Alright! Will be uploading this build to Curse today.