Running 4.5.3.2 on Mac OS X Leopard, the navigator / favourites state (open/closed,how much) doesn't save between PM sessions. Sorry, couldn't try the Beta yet. In effect, when I maximize the navigator and so hide the favourites half of the tree pane, next time I start PM, it reverts back to 1/4 showing favourites, 3/4 showing navigator. Just a minor annoyance, nothing serious ;-) But you might want to look into it for the final release or 4.6. Sorry if this is already corrected in the new Beta, couldn't test it here as I work currently on some pretty important work to me and not dare a beta alongside the current release (btw, can they coexist well on OS X - if I just rename the Photomechanic.app to PhotomechanicBeta.app ?)
Thanks, Frantisek