OWLViz for Protege 4.3 with MacOSX 10.8

To solve the "DOT Error" problem for OWLViz in Protege 4.3 with MacOSX 10.8 or later, you can try:

a. Install Graphviz for Mac.
b. Set the path of OWLViz (Reasoner-->Configure-->OWLViz-->Dot Application Path) as "/usr/local/bin/dot".

Then restart Protege, it works.