I cannot understand the order of the remembered directories. Many times, recently used directories are not in the list.
It appears to me, that if I select an entry in the list, the entry stays at the old position. That way, new directories will be appended at the top, and the frequently visited directories will be kicked out of the list.

Writing this, it sounds a lot like my other posting: http://forum.altap.cz/viewtopic.php?f=3&t=3708

Also tested with PB44.