Using TC v2.4.14 for 1.6.2 on craftbukkit 1.6.2-R1.0 with a world seed of -1472274453 and worldconfig of http://pastebin.com/B7cyeUHk (uses no custom biomes, the desert and ocean biomes are unmodified and TC is the only plugin on the server aside from essentials)

Teleport to 3300x, 3200z and you should find yourself in an ocean biome, but as far as I know, there should be no oceans due to the configuration.

Changing IceRarity from 60 to 50 keeps the rest of the terrain generation in the world seemingly the same (I overlayed the outputs from /tc map), but makes this ocean biome disappear.

Changing IceSize (without modifying IceRarity) from 1 to 2 also seems to 'fix' this

Changing FrozenOcean from true to false has no effect.

Hmm, this issue never got a response. Apologies.

This is caused by you having no Ice biomes. When TC tries to generate a ice area, it doesn't find a biome to generate, so the biome id stays 0, which turns out to be an ocean.