Exact same thing is happening to me after I agreed to install the latest version. Full reboot hasn't resolved. Simply won't open. Uninstalled & then reinstalled, but no change. Flat out will not open. Does briefly appear in Task Manager.
I'm also no longer able to find text inside a encrypted note after opening (de-crypted). My non-encrypted notes work fine.
Win PC.
v 10.3.7 build 2018 public
Editor: v111.0.14414
Service: v1.22.6