i also realised that, but i thought it was also a bug cause of the forge bug 
Yup, Forge
I'm going to assume that this bug also affects the MFE's? Cause when I slot in a charged Energy Crystal, it fully blows me away a good distance, the explosion settles after a little while, machine I was connecting to is gone (Rotary Macerator), and when I reopen the MFE's GUI, I find that the EC is discharged and only 32EU are sitting in the buffer, and when I try to put in another EC, either it explodes when connected to a machine, or gives me a saving chunk error when it's not connected.
I'll edit with a crash log in a minute.
EDIT: No crash log, but I noticed that the explosion happens when I put the EC into the MFE regardless of it being connected to anything. It's almost as if the EC is transferring EU into the MFE at too high a voltage.
EDIT2: Odd. Just installed Forge build 55 from a clean jar and the bug I reported just vanished. I'll double check the reactor one though.
EDIT3: Just tried the reactor bug, it did explode multiple times, but didn't display the explosion graphic. Definitely odd.
I just test it a lot of times for target of the bug, is from Forge, cause i ve just begin fresh .jar, and just install IC2 (after a lot of test with my other mods) .
You can check with just any machine, energy store machine, and 2 types of cables. Put a cable remove it, and put other one, you will see the new cable turns into the old one you just remove before.
This has got to be the best effect of this bug!
Forge 1.4.0.57 fixes the issue
