I have a problem with the interface too. I posted this a few days ago, still no solution:
I have encouraged a client to start using the Power BI service. They uploaded a small dataset, however when they sign in, the screen is not loading properly and they are unable to perform any tasks. The screenshot below, shows that the arrows in the Navigation Pane are not displayed and the buttons are greyed out. We have tried relaunching the browser, clearing the cache, restarting the machine etc. They are using Internet Explorer and due to policy cannot use another browser.
Hi @Anonymous This seems to be a bug when language is changed. The options are actually hiding in the first group. Zoom out your browser a little and you will see the options next to Explorar. This is more of the menu fitting on the top bar, since there is no space the options are going hidden.
Submitted an idea in Issue forums: