Hi, Carlosan!
Seems i solved this problem. I don't know how exactly, but against problem layers i noticed small arrows. When i clicked this, the coat restore to earlyer state and i could do to switch to voxel, and to make resample. This message looks simple - "CantGetBackToVoxel' by one word and button OK.
Now i don't get this message, and don't know what i did)))