The other bug with Mill Wizard is if you select any of the tools from the Select a New Tool Table, the tool path display doesn't work. It will generate the Gcode... just can't see the tool path. Also If there isn't a tool path display... you will also find Mill Wizard sets the feed rate to zero in the Gcode. To fix it you have to manually enter new values (actually any value will work) in the feed rate and plunge boxes.
If the toolpath doesnt display there is a a bug in the gcode. Selecting the toolpath from the table works well with the tables I have tested. Have you made some custom tool table? I would like to see it to figure out what is wrong. I experienced a toolpath failing to display yesterday, in front of a seminar at the Cabin Fever show, obviously not a good time to do any serious debug.
The feedrate to zero indicates the tool selection went wrong, the error check should prevent that.
Im on the road now, the end of Cabin Fever today, then on to Detroit for NAMES next weekend. I can read the source to look for errors, but cannot compile new code on my laptop. I will try to figure this one out and be ready for a fix when I get home.
There have been few bug reports so far, and they have been fixed, this one will too.