I have deleted and reloaded the app around ten times over the last two days. A bloke from Abbott even talked me through the process today but what he told me was no different to what I had been doing. However, the app did seem to be working properly. About two hours after reinstalling I realised that I had not switched on the alarms or linked my Novopen to the app. I decided to approach this in stages and switched on the alarms.. About two hours later all was well and so I linked my Novopen and almost immediately the blank screen/frozen app problems restarted. I have deleted and reinstalled the app again, switched on the alarms but NOT linked my Novopen. It is about an hour later now and the app is working as it should without my needing to scan. I have told Abbott about my findings in an email. I have asked for an immediate reply telling me what they are doing about the problem but I am not holding my breath.