I just rode EE last week, and the yeti wasn't moving. Also, the strobe was so quick that you barely even saw him. Truly the unique climax of the ride was lost. Very disappointing compared to the arm that came swooping at me two years ago. They stuck a ton of money into a working yeti, and it must be driving Joe Rohde crazy that the thing doesn't work.
I'm not an engineer, but how difficult can it really be to at least get an arm to move a few feet every 15 or 20 seconds? Sure, coordinating the more complex series of original movements might be a challenge, but just swooping the arm should be relatively simple. Cranes and excavators do this kind of movement all the time. It wouldn't even need to be timed to the roller coaster to be better than what they have now. Just swing it back and forth every few seconds to give some feeling of movement.
Honestly, the strobe light effect is pathetic by comparison. They could have put up a fur-covered cardboard cutout to get the same effect with a barely blinking strobe light. Any explanations as to why a better fix is not forthcoming?