Current cb is: 1.4.7-R1.0, b2624. No matter what command I use from voxel, I get a huge error log in the console, and nothing works. I know how to use the commands, because I've used this plugin many times before. Here is one of the stack traces I get:

http://pastebin.com/wcPqKqBQ

Some of the plugins I have are:
WorldEdit, WorldGuard, Multiverse(Core, Portals, Inventories), Essentials(Spawn, Protect, Core, GM), Disguisecraft(and ProtocolLib), Casino Slots, Anti-XRay, LogBlock, Factions, WorldBorder, Dynmap, Grief Prevention, Super Spleef, Infected, OtherDrops, EnderSpawn, EpicBossRecoded, CHDistantFarm, iSpawner.

Everything else I'm pretty sure shouldn't have any effect.
I tried both #195 and #196, both do the same thing for me.

Got the same error...

You are either using the wrong version of sniper or the wrong version of Bukkit.

Try this build http://ci.thevoxelbox.com/job/VoxelSniper/195/

That's one of the builds I tried. I tried both #195 and #196 like I said above.

I have been having the same issue.

I gonna have a look into it when I'm home. It seems to be an incompatibility between the sniper version you use and your Bukkit version.