Dropbox Authorization repeating

I have built and installed Corona Viewer on my iPhone5S using the latest release and got the prompt to authorize the app from Dropbox, tapped on Accept and got the email confirmation from Dropbox. However every few seconds the app keeps popping up the authorization dialog again! Accepting or cancelling it makes no difference it just keeps doing it. Checking my account settings in Dropbox shows that Corona Viewer is indeed authorized to access its own files.

Am I doing something wrong?

Stefan

same issue

same issue