System Information
Windows 7 64, HD 5770

Blender Version
Broken: Blender 2.69 r60995 + r61240
Worked: -

Short description of error
The Screw Modifier dont generate the meshs materials correct.
In fact, only the first materialslot is used - other materials are converted into the first, even if you havent used it at all.

Exact steps for others to reproduce the error
I have attached a file.

1. Create a plane and subdivide 1 time.
2. Use different materials for the subdivisions. (change color)
3. Add a Screw-Modifier. (screw the plane to make it easier to see)

Problem: The materials on the mesh are gone.