[Graphicman]

I just found the following

When Profiling inside or outside it does not matter
while using final pass allowance it simply neglect/reset any allowance value (make it a hidden zero)

To duplicate the case it is very easy
just draw a circle or any shape
Profiling inside or outside
make a value for Allowance
calculate the path
now add a final pass allowance value
calculate again
you will find that the toolpath has changed as if you have not added an Allowance value (0)
to confirm that, change the Allowance value to 0 and calculate again you will find that the toolpath has not changed

In short if you use final pass allowance you can not then use Allowance!!

I have tried that with Artcam 2008 and 2011, same behavior!