[wagonman76]

I meant reflash the sketch.

dcb showed me once how to do the bootloader and make a cable when mine was acting up, but I didnt need to do it. Even he said that doing the bootloader took "a cable and some patience". So I would only try the bootloader as an absolute last resort.

Another thing I found is that you (or at least I) can only have one file in the computer with the pde extension, and I keep it called mpguino.pde. I normally keep one saved with the default settings for each vehicle. I have to give these others a txt extension, or it will give an error and not load the sketch.

Yes the wrong version of Arduino will cause problems. I would deal with that first.