After updating multisite to 4.7 a couple of days ago I had these issues ie/ locked out, no password reset option, etc. I tried numerous methods to see if the password had been reset and stuff.
After reading this and another similar post in the forums I decided to try the core of what is mentioned here.
Logged into wordpress using ssh via winSCP (win10 freeware tool)
Change the folder plugins' to
hold-plugins’
Logged in to WP using same username and pswd as before it broke (succesfully)
Renamed hold-plugins' back to
plugins’
logged out and then back into WP
All plugins were there but required re-activating (some due for updates)
re-activated and logged out a few plugins at a time.
EVERYTHING IS FINE NOW – I left some plugins de-activated because they are not used and set email to smpt to my zoho email account (tested and works)
all up – 1/2 hour.
just in case it starts a lot with the 4.7 update (esp multisite)