I wonder if it's my local issue only. After upgrading to Sierra and Evernote 6.9.2 I noticed typing "a" anywhere (in Evernote or any other app) when Evernote is running behaves as "Paste to Evernote": new "Untitled" note is created with the current clipboard content. Obviously, I have no such shortcut and tried remapping a relevant shortcut in settings to anything or deleting it - nothing helps. Re-installed Evernote 6.9.2 from scratch, rebooted the Mac (it's mac Book Air, if it helps) - the problem still persists. I have disabled Evernote Helper as I never used it before.