If you updated to 1.2 Minecraft then you are in trouble as you cannot connect to the server! (yet)
Luckily, I have the solution!
Go to this link:
Instructions:
1) extract with winrar or 7zip
2) run it
3) select Full 1.1.0
4) click change
5) go onto opticraft
Removed link as it is against the rules - Mr