Then I would say hardware is more likely to be at fault. Change the active state of your E-Stop and remove your port cable and test with a voltmeter directly on the parallel port pins.
Hood

Thanks Hood. I have located a faulty 25 cond. ribbon cable inside my control enclosure as the cause of the latest problem. Now that I have fixed that, I can get back to solving the previous problem.
Regards,
Charlie

Thats good to hear Charlie. I still think your limit problem is hardware related as well as I think you said you get the Home LED occasionally flashing. If you can try like I suggested and connect a wire directly to your bob in place of the limit switches and see if the problem is still there even when you enable limits.

Hood

Hood:
I have finally located the source of the "noise" that was triggering my "reset" button, however the answer needs an explanation! I have all my limit switch (shielded) cables grounded on the limit switch end only. When I remove the ground wire, everything works normally with no triggering of the "reset" button. This is just the opposite of what you would expect. I have tested this both ways over an 8 hour period and feel confident that this was the problem. Any thoughts?
Charlie

Sounds like your ground point may not be a ground?

Logical conclusion! I will look into that. Thanks.