I will confirm that this release seems to have cleared up the same issue I was having on my server.
Time to see if it holds up under severe stress....
Well, it's falling apart under stress. I have a user who is crashing out when he encounters Copper ore from IC2. His configs match the server, and it's the negative array exception still. Not sure what's happening, but would love a point in the right direction.
His error log: http://pastebin.com/rx1ihUCj
Server console just shows a generic disconnect for a reset connection.