Unity 5 Tabs Disappear

I have an issue that in some projects Unity editor does not show the tabs for Project, Console and other tabs.
It looks like this:

Go to
Windows → Layouts → Default

This will reset the UI to the default and should fix this, if you have any questions let me know

Regards,
Mythral

Hi,
Thanks for the answer but it didn’t work. Even when I try different layouts it still remain without the tab header. I even try Window → Layout → Revert Factory Settings but it didn’t help.

Any other ideas?

I had the same problem. I moved unity main window to another screen and this solved it.