what version of RP2/IC2 are u using? coz in my case, i can't seem to connect the pneumatic tubes to reactor chamber (using technic pack build 6.0.7) for minecraft 1.1. i can only do the 5-chamber version. is there any way to unlock the 6th chamber?
Just update to 1.2.5
All relevant Mods except Computercraft are out for it.