Blank site on mac app


since today a few of us having a blank site on the Mattermost app. All of these persons working on Macbooks. It only happens when you restart or reload the app. If you don’t do it the app works normally.
The others that working with Windows pcs don’t have the problem. They can restart and reload the app the whole time and everything works. The mobile app is also working.
All with different client versions.

Someone knows why we have this problem on our mac apps?