[Support] Personal Safes & RP Tubes

For some reason or another, I cannot get my pneumatic tubes from RedPower to empty items into my personal safes while on my server. It works out just fine in SSP, at least in creative. I know that forge has been having issues lately and I wonder if it has something to do with that.

Server Mod List:
ModloaderMP 1.1 v2.1
MC Forge 1.3.1
Block break fix for Forge 1.3.1

IC2 1.64
RP2 Pre4d

that doesn't explain why it still works in single player though. That's the part that confuses me.