I just had the same issue, on Mac. The suggested workaround worked for me.
When you the start the “VST Connect Performer” application you will see a dialog telling you : “Please, be aware …”. There is a tick-box to the lower-left side : “Don’t show again”. Tick that box and accept the dialog. Quit the application and restart it again. The performer should work now … Correct?
I have VST Connect SE in Cubase pro 10.
I need my performers to have an easy, trouble-free setup process. Now i have to tell them these instructions? to avoid a UI bug that hasn’t been fixed for a year?
Disappointing.