Hi Trouzier, was ROLI Connect running when you attempted to launch ROLI Studio Player Beta? This is required for this version of ROLI Studio Player Beta (v0.1.0). If you click the "Open ROLI Connect" button in ROLI Studio Player, ensure you're still logged in, then click the "Retry" button in ROLI Studio Player, does this allow you access?
Please be aware that ROLI Studio Player Beta is supported on macOS 10.13 and above, so it may be possible that attempting to run ROLI Studio Player Beta on OSX 10.11 is the issue - we'll look into this.
If you're still experiencing issues, please open a new ticket with our support team, who will be able to help you get set up.
Same issue here as standalone, opened from Connect.
Logged out and in, restarted Connect and Player issue stays.
Checked firewall entries (Hands Off 3.2.3), all Roli allowed.
Started the AU unit in Logic (10.3.3) and works fine.
I've had this same issue. I'm Mac OS 10.11 on my main system, but will try it on my laptop with Sierra when I get the chance to see if it happens there too.