Only one Database comes up

I have several databases connected thru HeidiSQL, but as of this morning, only one can be accessed.

Last night when I had 2 sessions from 2 different databases open. When I got to the computer this morning, both sessions where not open any more.

And I'm only able to open to one database.

See screenshot attached. The general window where you can choose which connection you want does not come up. Nothing happens when you choose any other connection from the dropdown (see screenshot)

Any ideas?

Did you probably disable multiple instances, in Tools > Preferences?

No, it's still there