> Has anyone else experienced this and if so what would 
> be the best setting for the maximum mirror depth in 
> winhttrack.

Generally, the default setting (infinite) is good: the 
engine will, by default, limit the scope of the mirror to 
the internal site (for example, it will not go outside 
www.foo.com/bar/ if this was the starting URL ; except some 
included images, by default). 

In some rare cases (bogus generated pages which cause 
loops) you'll have to set a reasonnable (for example 12) 
depth. But again, try WITHOUT any limit first - it will 
generally fit your needs.