According to an article I saw somewhere (Jim Hill's site, I think), shortly after EE opened, they were experiencing some technical difficulties with the Yeti, so the Imagineers made a few lighting additions with strobes and such to have an alternative version in which he doesn't actually move. Apparently, the Yeti requires a huge amount of power and is very complex in his movements, and is prone to break-downs. So, when he does fail, they simply "flip a switch" and the "B" mode is shown, where he doesn't actually move, but is made to appear scary.
We rode it in September, at least half a dozen times, and he was working fine. Maybe something broke on him recently and they're awaiting replacement parts.
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