[ZendTo] Unable to write to DB

[Dariusz Radoszek]

I'm having the same problem after upgrading to MySQL 5.6. I'm currently 
on version 5.6.34. It was working perfectly for couple of years on 5.5. 
Trying to drop any file either from library or as an upload gives me 
this message:

Upload Error
Unable to add a dropoff record to the database, please notify the 
administrator.

I can't find anything helpful after enabling MySQL query log.

-- 
Darek