Board Thread:General Discussion/@comment-262546-20140907075501/@comment-262546-20141216113435

Upon watching the 8-chevron address being dialed in The Fifth Race, the computer shows the gate being dialed in the normal way (totally skipping the bottom 2 chevrons). The 7th glyph is locked in at the top chevron, and then, presumably, the 8th chevron is placed at one of the bottom two.

However, upon watching the 9-chevron address being dialed in Air, Part 1, the dialing computer shows all the chevrons simply being lit up in undisturbed/perfect clockwise order.

Then in Rising, Part 1, when the gate technician says "Chevron 6 encoded", the chevron that lights up appears to be what would normally be chevron 5 for a 7-glyph address, implying that one of the bottom 2 chevrons was locked (meaning it went in perfect clockwise order, albeit skipping one of the bottom chevrons)

So really, I don't think the producers ever made up their mind