Just updated my server to MC v1.2.5, Forge v3.1.2.97 and IC2 v1.95
On connecting to an existing world the server gives the following error :-
The area I'm loading into has most of the IC2 machines and cables.
I can restart the server and its then transformed the area all my IC2 machines were into sand and a few other blocks, if I walk into another area with more machines it does the same as above.
I've tested with a new world and it works fine, also without IC2 loaded (just MC v1.2.5 and Forge v3.1.2.97) and the world works fine.