Setting "wordscale" to 9 makes everything static

[GoogleCodeExporter]

Greetings. 

What steps will reproduce the problem?
1. Go to menu Plugins > SketchyPhysics > Physics Settings and set wordscale
to 9
2. Draw a rectangle, give it thickness and turn it into a group, or draw a
box primitive.
3. Start the simulation.

What is the expected output? What do you see instead?
Expected: The box should fall into the emptiness below, or if it is on a
floor, it should topple when pushed. 
Instead: it acts as if its state is set to "Static".

What version of the product are you using? On what operating system?
Windows XP SP2 + Google SketchUp 7.0.10247 + SketchyPhysics 3

Please provide any additional information below.

Sometimes if I make another object and then build a bigger group with it
and the original one, this new bigger object DOES fall (or topple) as
expected. I think any SketchyPhysics primitive or shape turned into a group
exhibit the same behaviour (haven't tested thoroughly).

If I set the worldscale back to 1, everything moves as it should, on the
same file (no need to start a new file with the new worldscale). 
What is "worldscale" anyway?

Original issue reported on code.google.com by fvdu...@gmail.com on 16 Dec 2009 at 7:07

[GoogleCodeExporter]

Update: 
Just made a 100mm box, a 300mm box and a 25mm sphere. 
Set worldscale at 6. 
Started the simulation.
The sphere and the big box fell, the small box stayed.

gone googling ...

Original comment by fvdu...@gmail.com on 16 Dec 2009 at 7:24