I had saved and tested a version of my project with Appery and made subsequent modifications to functionality. Following that I notice a blank screen on testing with the error on Chrome debug console: Uncaught SyntaxError: Unexpected token u, without any information that can help me look for source of the problem.
On reverting to the previous version I now get the same problem, although the version was working fine before.
My code is shared with support@appery, so you could take a look.
Thanks for your feedback in helping resolve this.