We did have a bad module for Build 18.104.22.168 on Mac OS 64-bit. Perhaps you 'cached' that bad module.
If you look at finder in:
See what library you have down there. Most likely you have the one that was corrupted. (adobecp64-301806-1.plugin).
Also, we've updated the player to build 233. Maybe it's just best you upgrade your Flash Player and it should re-download the (newer, clean) DRM modules