Direwolf20 pack v3 Wierd crash after using Mobspawners in a mystcraft age

[whynotken]

FTB Launcher version (if this isn't the newest update update and try again):Server
Minecraft Version:1.4.6 direwolf20 pack v3
Java version:
Detailed description of the issue / how can the issue be recreated:After having mobs spawn out of a Tier 3 (Skeloton) Spawner in a mystecraft age After the crash Extreme block lag opening inventory... impossible and many more crashes any help would be greatly appreciated.
Error logs: http://pastebin.com/jtg98MA5

 

[Ashzification]

Your Java is 7 updates behind.
Are you stuck in this age?
Are you able to load into the game?

 

[Jadedcat]

Moved to server tech support.

 

[whynotken]

Your Java is 7 updates behind.
Are you stuck in this age?
Are you able to load into the game?

Also just bouncing an ideal off you but do you believe Setting the Difficulty to peaceful would possibly solve this problem considering Description: Exception ticking world entities; was in there and i was using t3 skeloton spawner from soul shards

oh and I am not stuck in age and can load into world

 

[MirageScience]

I have repeated and tested this exact issue twice.
Both times I put 3 mob spawners in a trap tower that drop the mobs 23 blocks.
They were all tier 5, 1 skeleton, 1 zombie, and 1 angry zombie
It let me place them and they spawned mobs just fine but when i tried going back to the age it crashed the "internal server".
When I get back to my game and try going back to the age it lets me in, but the map is reset. I'm not sure if it's regenerated or if it's just restored to a previous save before I put the spawners and trap tower in it. (I think it regenerates, seeing as I found a portal gun in a chest very close to spawn)

I also have a memory leak problem (from mystcraft) which makes me have to delete any ages I don't really need less they cause me to lag and then crash.

Does anyone know if these two things are fixed in the latest version? or is FTB ultimate already using the latest version?