Offizieller Kommentar
@Tim > You accidentally slid that pane closed. Simply move your mouse to that left edge and drag the pane back open.

This is how my rb 4.0.4 looks now. As you see, tree view on the left had disappeared and there's no way to bring it back. There's also no sync manager button at the bottom when you connect usb flash. I don't know what went wrong, yesterday everything was fine but not today.
I tried resetting settings, reinstalling rb, nothing helps.
I'm on mac os yosemite and rb 4.0.4, please help, I can't manage my library anymore!
@Tim > You accidentally slid that pane closed. Simply move your mouse to that left edge and drag the pane back open.
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Anyone?
@Pulse, yep that's right, but it was extremelly hard to put it back! But I managed in the end, tx for the tip!
Yeah, it's tricky to get that edge without resizing the main rekordbox window. ;)
Same problem here. I can't get it solved. As a matter of fact, all info and possibilities on the bottom half of the screen are gone. Driving me completely bonkers!
@Kristof > Answered here; please don't crosspost.