java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
Operating system: Ubuntu 14.04
As I rendered a new world I pressed F3 to check everything seemed ok, looked at dirt and say the model was IDUNNOMYNAME:*C, it occured for sand and logs also.