Hey @ErynDaley ,
Thank you for posting on the Instructure Community!
I've had this happen to me a few times, and the solution for me was to fully disconnect from the WiFi and re-connect to the network. From there I was able to log back in and interact with the mobile app as expected.
If you still get a white screen after a prolonged period of time, never hesitate to reach out to support directly!
Best,
Noah
