Just chiming in here to say that I've got the same issue with 10.52.8 on my iMac 5k (3.7 GHz 6-Core Intel Core i5).
I was using a previous version of Evernote this morning without issue. I was prompted to relaunch Evernote to install 10.52.8 and the problem started immediately thereafter.
Hoping for a quick resolution to this one, I'm sick of hearing the fan on my iMac spooling up.