Stuck on a white screen with Roon logo (iPhone 6+)

Have roon Headless server running on a proprietary window based computer using Windows 7. Have the IOS app installed on my IPhone 6+. Have been using system for a few months with no problems. Today I start up the Roon server and go to my Iphone for the remote control. All I can get is a white screen with the Roon symbol and the lines coming out of the symbol are moving. Can’t get to any menus. I let it run for an hour and no change.

Appreciate help

@Steve_Miller1 not sure if this helps but the IOS app was updated yesterday, have you tried updating via the App Store or if that fails delete the app and download it again?