Arduino shows differences running same sketch uploaded from different computers

Projects Programming
1

Greetings all. I have a particular troubling issue that my friend and I cannot solve.

We wrote a sketch using my laptop. When I upload the sketch to an arduino from my laptop, everything works fine.

When we upload the same sketch from my friend's computer to the same exact arduino, the sketch does not run properly. Some aspects of the sketch seem to work okay- reading values from a potentiometer, outputting a signal via PWM- but some aspects of the sketch do not work at all, or appear to have errors.

Has anyone ever encountered this issue?

We are both running windows 7 and have the latest version of the arduino IDE and drivers installed.

Any assistance you can offer would be most appreciated.

2

I should say that we are using an arduino diecemila with an ATMEGA328 chip.

3

http://arduino.cc/forum/index.php/topic,97455.0.html

Pay close attention to #6, fifth bullet.

4

I can explain all of the differences that you have described.
Finished !