Hello there, Soufflestudio.
Being stuck on that loading screen is definitely something we need to fix right away.
Are you accessing QuickBooks Self-Employed through the mobile app or through a web browser?
If you're using a browser, go to your browser's settings, select "All time" for the time range, check the cache and cookies, then close all tabs and windows.
After clearing everything, open a fresh incognito window or private browsing mode and head to QuickBooks Self-Employed. Sign in from there and see if your data loads.
If the loading message persists, try accessing your account with Chrome or a different browser to see if the issue is browser-related.
However, if you're using the app, close the QBSE app completely, then clear the cache or app data in your phone's Settings. Open the app again and sign in.
The Community is always here if you need anything else.