OK,

I have been having the same problems over and over again. After solving the Merge Vertice problem earlier, I suddenly have another delema...I can't convert from poly to subdivision after merging vertices. The script Editor said...

select -r polySurface1 ;
deleteInternalValence2Verts |polySurface1|polySurfaceShape2;
polyToSubdiv -ap 0 -ch off -aut on -maxPolyCount 1000 -maxEdgesPerVert 50 |polySurface1|polySurfaceShape2;
// Error: polyToSubdiv1 (Poly To Subdiv Node): One or more vertices is nonmanifold.
// Nonmanifold geometry cannot be converted to a subdivision surface.
// To clean up nonmanifold vertices, use Polygons->Cleanup with the nonmanifold option. //
// Error: Command polyToSubdiv failed. Open Script Editor for details. //

So, I went to Polygons->Cleanup and all it showed was some highlighted faces...
What should I do? Any immediate help is helpful...