>I've built LyX 1.6.3 under Red Hat Enterprise 5.3, with
>Qt 4.5 (a slightly older version than the most recent
>one, which I couldn't get to work). Each time I try to
>open a directory to open or save a document, LyX crashes
>with the following message:

>(<unknown>:7300): Gtk-WARNING **: GtkEntry - did not receive
>focus-out-event. If you connect a handler to this signal, it
>must return FALSE so the entry gets the event as well

I know nothing about Gtk+LyX, but does this reflect your problem: 

http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry
&id=254614 

?

Vincent