i've found a dirty fix by myself, but i'm not going to publish or disclose this fix here, because i prefer waiting for an official bug fix; i still don't understand how such a regression could happen (in 10.10 everithing worked fine, same hardware)
i've found a dirty fix by myself, but i'm not going to publish or disclose this fix here, because i prefer waiting for an official bug fix; i still don't understand how such a regression could happen (in 10.10 everithing worked fine, same hardware)