Recently I wanted to see all transactions for a particular payee in my register but there was no drop down icon on the payee line. Turns out that one needs to have a memorized transaction for that payee in order to have the drop down populated. Many of my entries come into my register via a automatic "Bills, Income, and Transfers" register entry and they're not in the memorized transaction list.
Seems like a waste to have to memorize one of these to get that drop down facility to work.
(Where's my friend John Pollard when you need him?)