Problem with Motor Shield v2.0

[mah]

I recently purchased a Motor Shield and have encountered a problem that has me puzzled. The Motor Shield is connected to an Arduino Due. The Stepper Motor test program works great on either port (Stepper ID 918). A DC motor connected to any port and upload of the DC Motor Test program fails. Motor is Hobby Motor ID 711. The Motor just spins, it doesn't move forward and backward as the program is written. The serial port also locks up sometimes and doesn't respond with Tick Tock Teck. To me this points to a software problem because the Stepper Motor works on either of the TB6612FNG chips. Could someone point me in the right direction to finding a solution to this puzzle? Arduino IDE is version 1.5.6-r2 running on Windows 7.0 PC.

[adafruit_support_bill]

I would suspect software also. 1.5.x is still beta-ware and I'm not sure that the Wire library is completely ready for prime-time.

[mah]

Thanks for the quick response. Unfortunately that was the response I sort of expected. If I only knew enough about programming I'd take a look at the Wire library myself BUT its way over my head. I compared the SCL and SDA ith a scope when the two programs were running and there is a major difference in pulse width. It only proves that I need to learn a lot more to solve this sort of problem.

[adafruit_support_bill]

I'm not sure what the issues are. The Wire library for 1.5 was not in the earlier releases at all. And the the current version still appears to have problems. There are a lot of smart folks working on it, so I expect it must be a non-trivial problem.