No way to switch between object and edit modes Elementary OS

Hi all

Recently I installed Elementary OS and got a official build from the Blender website.

However, I now find out that I cannot switch between Objectmode and Editmode.
And that is by the Tab button

Edit: I 1 time did, but then nothing again…

Are there any other Elementary useres who experiences the same?
I believe it has something to do with the active corners, because sometimes resizing the window can help