When a SharePoint-backed Canvas app gets stuck while loading—especially during editing—it’s often due to issues with data connections, permissions, or heavy logic in the app’s startup process. Even after clearing cache, switching browsers, or restoring previous versions, the problem can persist if the root cause isn’t addressed.
Start by checking SharePoint list permissions. If the app references lists that the current user doesn’t have access to, it can silently fail during load. Next, inspect your data sources —sometimes a corrupted or outdated SharePoint connection can cause the app to hang. Try removing and re-adding the data source.
Another common culprit is the App.OnStart property. If it contains complex logic, large data loads, or non-delegable queries, it can significantly delay or block loading. Simplify this logic or move it to screen-level `OnVisible` events where possible.
To diagnose further, use Power Apps Monitor. It provides a real-time trace of what’s happening during app load, including failed data calls or control rendering issues. If the app loads in preview mode but not when published, the issue may be tied to environment settings or user roles.
As a last resort, create a minimal version of the app by duplicating it and removing most controls and data sources. If the stripped-down version loads, reintroduce components one by one to isolate the problem.
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