I just tried that 1.63 'release' with ModLoaderMP v2.1 installed in to the server.jar -after- Forge.
The behavior of IC2 blocks and RP2 blocks is now -way- off. I am unable to place redstone wire (RP2) against IC2 blocks. I am -also- unable to shift+click to place a switch on to a reactor chamber. --Further-- Injection of redstone signal in to reactor chamber by an RP2 not-gate (I think we used a NOR gate for that, which one isn't important) to shut it off -also- does not work.
I don't believe the issues of #2 are caused by RP2 since the normal switch no longer places either. Is this just a pre-release bug?
An additional thought to occur to me since my initial reply in the other thread where this was off-topic: is this potentially fixed by the rail-placement fix added to Forge or does it need a similar adjustment in IC2 code?