Mudbox missing material presets and lighting presets

hi, i stumbled upon this problem sometimes now:
after installation and starting of Mudbox, the material and lighting presets were not there.
so here is the solution in a thread on area.autodesk.com njmaxaddict found the fix, and it worked for me.

here how it goes:

1. Move the “Materials” and “Lights” directories

From here:
C:\Documents and Settings\Administrator\My Documents\Mudbox\2009-x64\presets

To here:
C:\Documents and Settings\Administrator\My Documents\Mudbox\2009-x64\data\presets\

2. Then delete the Trays directory here:

C:\Documents and Settings\Administrator\My Documents\Mudbox\2009-x64\settings\Trays