Minecraft – Cheat Mode Not working NEI

I've had the same problem with various updates to Technic. There's nothing you can do.

As suggested, always make sure you have a backup before updating. Also, I would recommend checking the Update page of the technic pack before updating. Some updates will result in current items to change ID's, or simply disappear.

This is caused by the spawning algorithm. On the ocean, there are significantly less areas suitable for spawning. When you build a house over/on the ocean, you provide a large suitable area for them to spawn in, and because it is the only one in the area, everything that would normally be spread out around there instead spawns inside your house.