Suddenly, when typing in a Payee name or Category name in Expenses, the payees or categories I've created no longer appear (as though they were never created).

You can open QuickBooks Online in an incognito/private window or a different browser to rule out cached data or extension issues that can make the Payee and Category dropdowns look empty.

If the problem continues, please contact our Live Support team so they can review your account securely and check for any known system issues affecting Payee names and categories.

The Community is always here if you need anything else.