The wallet will only check already used addresses periodically, at least once every 24hrs though.

If you click refresh or press the balance, the wallet will make a "normal sync" which does not sync already used addresses.
Refresh has about a 30% chance to do a "full sync" rather than a "normal sync" when pressing it, then it will check used addresses.

So spamming refresh is one way to go, reloading account is the safe way.