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Worked for me - THANK YOU!
Same for me... logging out and coming back in (couple times) got it back for me too. I didn't have to restart the Editor either .
Super annoying! Happens to me once in a while on 5.3 ... man I wish there was a fix besides re-importing everything! Time is precious!
I hear you man - I'm trying to find a good resource to explain all the Animator transition stuff too. I can't get my transitions working right and...