popup is not showing … preventing the use of anything on the app
You’ll want to contact email@example.com by email. Include a full description of exactly how and when this happens, and attach an .rp file if it has to do with one prototype specifically. This is a user forum and Axure support people don’t usually reply to posts here.
In the meantime, I can only suggest rebooting everything–especially if your “popup” has worked in the past.