Support Request: Taking products out of machines

Hi,
I've set up a SMP server with my friends, with IndustrialCraft 1.337b and Buildcraft 2.2.5 on Minecraft 1.8.1. When I (the host) try to take out the macerated dusts from a macerator, the server crashes with this error code in the console:

[SEVERE] Unexpected exception
java.lang.NoSuchMethodError: ic2.common.ContainerIC2.a(Lhm;IIZ)Z
	at ic2.common.ContainerIC2.transferToSlots(ContainerIC2.java:108)
	at ic2.common.ContainerIC2.a(ContainerIC2.java:61)
	at df.a(SourceFile:108)
	at iw.a(NetServerHandler.java:603)
	at my.a(SourceFile:28)
	at ma.b(SourceFile:272)
	at iw.a(NetServerHandler.java:45)
	at dr.a(SourceFile:108)
	at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:369)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:287)
	at ce.run(SourceFile:417)

Note that if anyone else takes the dusts out of the macerator, the server just lags for a few seconds but keeps going. What's wrong?
EDIT: It seems me and one friend can't take it out, but other two can take it out fine. I don't know what's wrong now. We all use the exact same jar (one of us modded it and sent it to others), and put mods in correctly, the same way
EDIT2: This seems to now happen with products of all machines - the same happened with iron furnace making sticky resin into rubber or smelting iron.
EDIT3: I copied my friend's config file. No effect. Tried deleting mod files and having them restore to default - no effect as well. It makes it unplayable

Oh wow, that really seems to be it. I thought I didn't shift-click before, seems I've been doing it all the time. I'm just really used to it. Thanks
EDIT: I feel stupid now, I played this mod before and I forgot this basic rule :x