netrw (?) breaking window navigation on stock Debian Stable

I'm fairly certain I haven't initiated any changes that would impact
this, but I just noticed this today and am trying track down when/why
it happened, and how to solve it.

To replicate on Debian Stable:

bash$ cat reproducible_vimrc
set nocp
syn on

bash$ vi -u reproducible_vimrc some_dir/

this should open the contents of the directory in a netrw window
(":set ft" returns "netrw"). From here, issue ":new" or select a
file/subdirectory and press "o" to open it in a new window. From
here, I tried to navigate back to the original netrw directory listing
using <c-w>k to open other files but vim refused to navigate back to
the window (no error message, just a failure to navigate to the
window as would normally happen). I also tried ":wincmd k" with
identical failure. Additionally, things like

:let @a=''|windo 1yA

fails to visit all the windows, and @a remains empty (not even
pulling in the first line of the file I'm currently in). Similarly

:windo $

doesn't move my current window to the last line, let alone the netrw
window.

If I issue

vi -u reproducible_vimrc some_dir/

and then issue ":new", I have similar problems with navigating back
into the netrw window. If I use "--noplugin", it no longer seems to
load the netrw plugin at all (expected), so I have control over my
windows still.

The headers of /usr/share/vim/vim73/autoload/netrw.vim state that
it's

" Date: Apr 05, 2012
" Version: 145

It works as I'd expect in the other environments I have available:
Vim 7.0 (on Win32, with r98 of netrw) and Vim 7.3.457 (on Ubuntu,
with the same r145 of netrw).

Is there something I'm missing, or some assumption that netwr makes
about my vimrc that would trigger this behavior? Or a way to track
down the problematic behavior?

-tim


VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Feb 10 2013 02:27:59)
Included patches: 1-547
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by jamessan@debian.org
Huge version with GTK2 GUI. Features included (+) or not (-):
+arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset
+cindent +clientserver +clipboard +cmdline_compl +cmdline_hist
+cmdline_info +comments +conceal +cryptv +cscope +cursorbind
+cursorshape +dialog_con_gui +diff +digraphs +dnd -ebcdic +emacs_tags
+eval +ex_extra +extra_search +farsi +file_in_path +find_in_path
+float +folding -footer +fork() +gettext -hangul_input +iconv
+insert_expand +jumplist +keymap +langmap +libcall +linebreak
+lispindent +listcmds +localmap +lua +menu +mksession +modify_fname
+mouse +mouseshape +mouse_dec +mouse_gpm -mouse_jsbterm
+mouse_netterm -mouse_sysmouse +mouse_xterm +mouse_urxvt +multi_byte
+multi_lang -mzscheme +netbeans_intg +path_extra +perl
+persistent_undo +postscript +printer +profile +python -python3
+quickfix +reltime +rightleft +ruby +scrollbind +signs +smartindent
-sniff +startuptime +statusline -sun_workshop +syntax +tag_binary
+tag_old_static -tag_any_white +tcl +terminfo +termresponse
+textobjects +title +toolbar +user_commands +vertsplit +virtualedit
+visual +visualextra +viminfo +vreplace +wildignore +wildmenu
+windows +writebackup +X11 -xfontset +xim +xsmp_interact
+xterm_clipboard -xterm_save system vimrc file: "$VIM/vimrc" user
vimrc file: "$HOME/.vimrc" user exrc file: "$HOME/.exrc" system
gvimrc file: "$VIM/gvimrc" user gvimrc file: "$HOME/.gvimrc"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK
-pthread -I/usr/include/gtk-2.0
-I/usr/lib/x86_64-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0
-I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0
-I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/
-I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
-I/usr/include/pixman-1 -I/usr/include/freetype2
-I/usr/include/libpng12 -g -O2 -fstack-protector
--param=ssp-buffer-size=4 -Wformat -Werror=format-security
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -I/usr/include/tcl8.5
-D_REENTRANT=1 -D_THREAD_SAFE=1 -D_LARGEFILE64_SOURCE=1 Linking:
gcc -L. -Wl,-z,relro -rdynamic -Wl,-export-dynamic -Wl,-E
-Wl,-z,relro -Wl,--as-needed -o vim -lgtk-x11-2.0 -lgdk-x11-2.0
-latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0
-lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0
-lglib-2.0 -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm
-ltinfo -lnsl -lselinux -lacl -lattr -lgpm -L/usr/lib -llua5.1
-Wl,-E -fstack-protector -L/usr/local/lib -L/usr/lib/perl/5.14/CORE
-lperl -ldl -lm -lpthread -lcrypt -L/usr/lib/python2.7/config
-lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic
-Wl,-O1 -Wl,-Bsymbolic-functions -L/usr/lib -ltcl8.5 -ldl -lpthread
-lieee -lm -lruby-1.9.1 -lpthread -lrt -ldl -lcrypt -lm -L/usr/lib

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