Thank you for your message, and we're sorry we didn't reply sooner and for the issue.
What type of files are you trying to edit? Did you see an error message? Are the projects created in the old version?
Did you try to use another browser to edit the projects? What happens if you refresh that page or close it to open a new one after clearing the caches and cookies? Please be precise about the device, the browser you're using and the OS version.
Can you share a screenshot of the files so we can understand what you're experiencing?
We'll come to your aid, and we look forward to hearing from you.