Mudbox 2011 - Can´t use Sculpttool with sizes below 1.9

Slaught

Threadtitle says it all.
Mudbox won´t let me use the sculpting tool with sizes below 1.9
I can drag it along the model but nothing happens.

Anyone know what might cause this?

The mesh should be dense enough.

Ged

is your model perhaps too small or too big? mudbox has problems with scale sometimes

Slaught

It´s slightly smaller than the demo head that came with mudbox.
I scaled it up but now my pinch tool started acting weird too...Is there some way to reset mudbox?
Maybe I accidentally messed something up?

jam-i-am

when you scale an object in mudbox it still thinks its as small as it was before the scale, so that means your brushes may start acting weird. after the scale, export it and import it back in.

you can reset mud by deleting your mudbox folder in your "my documents" location.