snappyHexMesh. irregular cells on snap stage
 

Using snappyHexMesh some irregular cells were generated on snap stage (see picture). I've tried to modify meshQualityDict and irregular cell disappears after that. But the new incorrect cell appears in the next place... It seams like a bug.. (test case is attached. Select the coloring by cell. Irregular cells on surface have a maximum value of velocity)
Test case: https://yadi.sk/d/CAGG4zC0fhm3q [^]