I just came here to say, that this is ultimately what worked for me. I disabled everything in the Accessibility settings, and like magic I could do the "say Ok Google" three times. Super strange that this fixed it for me, but I'm just glad that I now have OK Google working! Thanks a million!In case this helps someone, I was having the same problem where the OK Google Detection was not working on my HTC One M8. I searched all over and tried a bunch of things, but then I found a blog that fixed it for me. http://forum.cyanogenmod.org/topic/97050-ok-google-and-wifi-cell-connectivity-issues-in-m8/
In there, he said an accessibility service was not playing nice with OK Google, so I went into Settings\Accessibility and disabled everything in there. After that, my OK Google detection worked. Then I just had to turn things back on one at a time until I found what was breaking OK Google. In my case it was the JVC Smartphone Control. I have to figure out what to do now because I need that app to connect my phone to my JVC car stereo (KWV50BT). At least I know what is causing it.
HTH
Ken
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