Just chiming in to say, AdBlock extension was definitely causing my issue. Evernote extension had installed fine, I signed in with my credentials, etc. but when it came time to actually use it, nothing at all would happen when I clicked the clipper button. I paused the AdBlock extension, refreshed the page I was trying to clip (just pausing AdBlock was not enough), and then the clipper worked perfectly. Safari version: 8.0.6 (10600.6.3) OSX version: 10.10.3 (14D136) Other extensions loaded which do not seem to conflict w/ Evernote: Pinterest, 1Password Since Evernote clipping is more essential to my workflow than ad blocking, I'm just going to leave adblock turned off until the conflict can be resolved (if ever).