- mach4 hobby
- installed a new computer (thinkpad 540p)
- installed all software including mach4 (with latest update)
- mach4 works correctly EXCEPT for the page up/page down function for the z axis
- put old computer back, all works well including page up/down
- put new laptop back, still no page up/down

soooo, obviously it's a configuration, not mechanical issue.
i do not know how/where to fix the configuration.