Hello,
I did a search for nether ore threads and didn't find anyone with my problem. I recently installed Tekkit SMP and got everything up and running fine. However, the nether ores mod spawned of the the ore in the world, not in the nether.
When entering the nether you can see areas where the ores were supposed to spawn, but they are only empty blocks. They can't be broken. When you try to walk through or over them, your character gets stuck.
Anyone have any ideas on how to fix this? I checked config files and didn't see anything that obviously stated options on where they spawn.