Mainstage 3.4 - OpenGL issue...

Hi !

I just updated Mainstage from the 3.3 to the brand new 3.4 version.

And since... I can't use it anymore due to an OpenGL compatibility issue... ???

I'm totally blocked... and I need to use Mainstage.

I thought the Mac AppStore checked our system before downloading to be sure the download was compatible but apprently no...

What can I do ? Is it possible to downgrade to the 3.3 ? I don't have a backup of the 3.3 though.

Thanks in advance for any help.