Strange behaviour by user switcher in Fedora 7

[Dr. Muhammad Masroor Ali]

Dear All,

I am facing a strange problem with the user switcher in Fedora 7 and
can not seem to get the hang of it.

Let us say that I (User A) am busy with my work with many windows
open. Then my son (User B) wants to play games for say 30
minutes. Since I want to resume as soon as he is finished, I (A) do
not log out and use user switcher to log him (B) in. When he is done,
he logs out properly (user switcher is not used). Then the problem
occurs. The screen goes blank, where the screen lock for user A was
supposed to appear.

After some considerable period (n minutes), screen lock prompt for
user A appears. Just on a hunch, I changed screen saver timeout for
user A, and it appears that n has got something to do with this, but I
am not sure.

Could you please tell me what is happening? Is it a bug? A feature? Or
I am missing something?

Thanks in advance.

I am also putting below the .xsession-errors contents if it is of any 
interest.

////////////////////////////////////////////////////
localuser:masroor being added to access control list
SESSION_MANAGER=local/localhost.localdomain:/tmp/.ICE-unix/5411
** Message: Could not connect to power manager: Could not get owner of name 
'org
.gnome.PowerManager': no such name
winscard_clnt.c:3349:SCardCheckDaemonAvailability() PCSC Not Running
error getting update info:  Cannot open/read repomd.xml file for repository: 
fed
ora
error getting update info:  Cannot open/read repomd.xml file for repository: 
fed
ora
** Message: Found best visual for GL: 0x25
error getting update info:  Cannot open/read repomd.xml file for repository: 
fed
ora
** Message: Found best visual for GL: 0x25
error getting update info:  Cannot open/read repomd.xml file for repository: 
fed
ora
error getting update info:  Cannot open/read repomd.xml file for repository: 
fed
ora
ERROR: ld.so: object 'libjvm.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'libawt.so' from LD_PRELOAD cannot be preloaded: ignored.
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
** Message: GetValue variable 1 (1)
** Message: GetValue variable 2 (2)
ScimInputContextPlugin()
~ScimInputContextPlugin()
ScimInputContextPlugin()

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: g_type_add_interface_static: 
assertion
 `G_TYPE_IS_INSTANTIATABLE (instance_type)' failed
(process:7155): GLib-GObject-CRITICAL **: g_type_add_interface_static: 
assertion
 `G_TYPE_IS_INSTANTIATABLE (instance_type)' failed

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): GLib-GObject-CRITICAL **: g_object_new: assertion 
`G_TYPE_IS_OBJ
ECT (object_type)' failed

(process:7155): GLib-GObject-CRITICAL **: gtype.c:2242: initialization 
assertion
 failed, use IA__g_type_init() prior to this function

(process:7155): Gdk-CRITICAL **: gdk_xid_table_lookup_for_display: assertion 
`GD
K_IS_DISPLAY (display)' failed

////////////////////////////////////////////////////

Dr. Muhammad Masroor Ali
Professor and Head
Department of Computer Science and Engineering
Bangladesh University of Engineering and Technology
Dhaka-1000, Bangladesh

Phone: 880 2 966 5650 (PABX)
FAX: 880 2 861 3046, 880 2 966 5622