That would be quite intriguing. There is no way that I know of without actually turning the string around by hand. I would ask if you dropped an inverse profile on the channel, but since your spare worked, that wouldn't make sense.
Not to argue with you, but if the ColoRamII do not have an optical sensor, then what is the sensor? It has some sensor, hence the foil tags on the strings and the fact that you have to put the gel string in the sensor slot or you blow fuses.
The OP stated they all had been working (ie, had previously been all in the same color). Now, maybe he's never noticed before (didn't sound like he had much troubleshooting time either), but a wrong color sounds unlikely if the problem just appeared.
Optical or otherwise, there is a sensor on the bottom left of the scroller.
--Sean
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