ZBrushCentral

This mesh contains nonstandard polygons

I made a simple 3D text in another 3D-application, exported it to obj. When I open it in Zbrush it looks weird and I get this message:

This mesh contains nonstandard polygons (more than 4 sides).
Would you like to split these polygons to sets of symmetrical triangles?
or to a combination of Quads and Trianagles?

I’ve tried both, none of these fixes my problem. What do I need do?

What application? No pics…

I made the text in Modo.

http://sv.tinypic.com/view.php?pic=rswgev&s=8#.Uuv8JbTGLAE

When I open it in Zbrush: http://i62.tinypic.com/o93hpk.png

Maybe divide more before you export.