Have tried on two machines, the latest a new 16.04 (lts) Ubuntu with Wine.. I get the start up screen to set up the connection, the "new" button is black but works but the red quit button (upper left will not terminate the program I never get past the connection screen. I'm using some other clients successfully with the local Mariadb installation. I also ran into the same situation with Ubuntu 14.04. Not sure if there is some secret incantation with Wine ( I have never run anything with Wine before, I have enjoyed Heidi on Windows.. Would like to carry it forward to Linux as I leave Windows behind..
I don't get any error messages.