Found a bit of a bug where the use of a tool can get stuck but isn't visible. The zoom option on a bow can do that. but doesn't do that always and the voxel tool can do that. Maybe a few others tools as well but those don't have negative side affects to notice them. It seems that when leaving the master mode with voxel tool active it will get stuck making it imposable for your character to pick up small grid. I have no yet found what triggers the bug on the bow but in both cases re-adding the tool to the bar then re-selecting the tool and the deselecting it will purge the bug. The nasty thing about this bug is that is persists though death, relog and even server reboot and I suspect it effects other tools as well.