When I try solo playtime testing the experience in Studio, an error occurs: exception while signaling: The Parent property of StarterPlayer is locked - Studio I tried reinstalling, updating and refreshing Studio and it didn’t work. I also removed all scripts and issue occurred again.
A private message is associated with this bug report
Thank you for this report, I believe this might be the same issue described in this post: "exception while signaling: The Parent property of StarterPlayer is locked" —happens on every new place, only under one Windows user account
We’re currently investigating the issue.
edit: I see we’ve already chatted back and forth in the other thread 
Yes, I needed to create that so I can share private message! Thanks for reviewing!