For a while I have had problems with featherfall 4 boots, reducing no damage whatsoever, I have made over 7 featherfall 4 boots, with different protection enchantments accompanying them, out of diamond and iron, even pure featherfall 4. Nothing worked, I assumed this was just me since it was working for QuietSea and I haven't heard anyone else have problems. I have even tried with a fresh minecraft folder, deleting it all and downloading a new one. The weird thing is it works in ssp. And I found out just now that it doesn't work for Salmon_Flavour either, so I'm starting to suspect it being some weird bug on the server caused by either the build, 1.5 update, plugin bugs or perhaps permissions issues. I have a hunch it might be mcMmo causing this, especially since ender pearls no longer deals fall damage.