I haven’t seen this reported- and the first thing to do is rule out a problem on your system.
Do the essential troubleshooting step of starting with initialized prefs. Use Cubase Safe Start Mode to do that. If you don’t know about it yet, a quick google search of the italicized phrase will find it.
Based on what little you have said, I would also suggest making sure you are not running Cubase as Admin.
Also, if you didn’t receive an automated confirmation of the ticket you opened from your SB account, I would suggest opening a new one, and be sure to fill it out completely. It is remotely possible that your email provider is filtering out emails from SB, you might try changing your email in your SB account.