Thanks. I have the latest version - updated using App Store on ipad. Won't I lose all the photos I've downloaded if I uninstall and reinstall? The clear cache button does work but its just painfully slow!
Since the photos are actually stored in the cloud, you will not lose them if you uninstall the app. You will experience some delay initially when you first login because the app will need to recreate the thumbnails. Other than that, it should work as expected. Please let me know if you still have issues after reinstalling.