A setting of 0.001 for smallest scale tends to cause issues. But consider whether you actually need millimeter-scale features. Everything is measured in meters, so 0.001 is 1 1000th of a meter, or a millimeter. It's very unlikely you actually need to use scales that small.
That being said of course TG should handle this situation more elegantly, perhaps imposing a lower limit on scales.
- Oshyan