poor initial selection of type-ahead options

When I start typing an email address (on the To: line for example), eM Client quickly offers a list of email addresses that match what I’ve typed. They appear to be displayed in most-recent first order; I’m not sure about that but I know that the one I usually want is on the top of the list. However, the item that’s initially highlighted (that I could quickly select by hitting enter rather than reaching for the mouse or arrow keys) seems to be random and is only the top item a fraction of the time.

How can I get this to behave properly and always highlight the top item?

Thanks,
Matt