First off, I'm not entirely sure if this is a "bug" or not, and if so if it is from Sync or one of the many other mods I have. I recently updated my server to 2.2.0 after having been hit by the Ars Magica 2 level loss. Now, I am unable to pickup or place certain blocks. So far, this has happened with Ender Tanks from Ender Storage, as well as the Arcane Bore base from Thaumcraft 4.1, I am however able to place the bore on the base, and unable to place the Arcane Lamp on the base. Restarting the server seems to correct the issue, until I switch to one of the shells.

I tried in a single player world, with the only mods being the necessary Forge mods, Code Chicken Core, Ender Storage, iChun Util, and Sync. I even tested with only Forge, iChunUtil, and Sync, and am unable to pick up vanilla MC items such as the Enchantment table, Anvil, the chest, and obsidian. I can break all these items, but am unable to pick them up, and if I give one, seem to be unable to place them. To me it seems that it has to do with swapping shells, as it doesn't happen(at least if the server has been reset) until switching shells. Also, someone who hasn't created a shell yet seems to be unaffected.

It turns out, that while this bug is occurring, the affected player seems to be invulnerable. So far the only thing that has actually hurt me is using the Life Tap spell from Ars Magica. Explosions don't another player hitting me doesn't morphing into an Enderman or Blaze and standing in water doesn't, nor does drowning or starving.