I'm working with about 15 Apollo SmartMove color scrollers and pretty much everything is going well except for this alignment issue. One or two of the scrollers seem to get off on their positioning with the gel scroll. For example, if I set the scrollers to gel 5 on the string, just a couple of them will stop between 4 and 5. What's weird is that they don't always do this, but it happens often enough that I'd like to try and fix it before the show opens. At first, I thought there was a power issue. Everything is being run by 2 400w Apollo power packs, and I've got no more than 6 of the scrollers in a circuit. Also I'm no where close to the 200 ft limit on the DMX cable. I tried cleaning the optic sensors as well, but that didn't seem to fix the problem either. Any help or ideas would be greatly appreciated!