I was not sure where to put this but this forum seems right.

The Z-axis seems to be really problematic in Rift.

Recent Z axis fixes: you dont fall through the world while feared. Yeay!

More Z axis problems are still in game though.

If a player jumps and then gets mezzed/stunned etc in midair when they land they become immune to all melee attacks for the duration. This is really annoying and pretty broken IMO.