> Today's GNU Emacs CVS snapshot, Mon, 2007 Jul 16  10:38 UTC
 > GNU Emacs 22.1.50.73 (i686-pc-linux-gnu, GTK+ Version 2.10.13)
 > started with
 >     /usr/local/src/emacs/src/emacs -Q -D
 > and with
 >     /usr/local/src/emacs/src/emacs -Q -D -nw
 >
 > Starting yesterday and today's snapshots of Emacs, I could not get
 > other windows, just the one.
 >
 > That is to say,
 >
 >     `C-x 4 C-f' (find-file-other-window)
 >
 > acts like
 >
 >     `C-x C-f' (find-file)
 >
 > Saturday's snapshot works fine.
 >
 > I could not see anything wrong with the recent changes to src/window.c
 >
 > This first occured yesterday, 15 July 2007.
 >

Thanks for reporting.  Would the attached patch fix it?