Can't attach Reactor Chambers to my reactor

Hello everybody,

I have a real big problem with my Nuclear Reactor:

-when I've placed only the reactor, everything is fine BUT if I attach 1 or 2 Reactor chambers and quit the game, the doom awaits me when I restart the game:
The additional chambers are gone! No more chambers, non, nada, niente!
Only the reactor, but he is empty...

I think that this can be a conflict between the mods, but I just Installed IC, BuildCraft 2.10, McForge, and TrainMod v1.21

I would be happy about any helpful hints.

(I apologize for my english, I'm german )

Quote from Adien_Alexander

What version of IC2 did you install? The Reactors resetting itself/chunks was a known issue in v.9, but should have been fixed in the 1.0 and 1.15 releases.

I still have 0.90 so I will try patch it.
Thanks.