control-center-3.0.1.1-4.fc15 has been submitted as an update for Fedora 15.
https://admin.fedoraproject.org/updates/control-center-3.0.1.1-4.fc15

Package control-center-3.0.1.1-4.fc15:
* should fix your issue,
* was pushed to the Fedora 15 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing control-center-3.0.1.1-4.fc15'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/control-center-3.0.1.1-4.fc15
then log in and leave karma (feedback).

control-center-3.0.1.1-4.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

This looks bogus. I remove metacity from my machine, and "gnome-control-center universal-access" works.

What crashed and where exactly?

(In reply to comment #4)

I tried once again and got the same crash. "gnome-control-center universal-access" simply crashed without showing anything on screen.

| "Process /usr/bin/gnome-control-center was killed by signal 11 (SIGSEGV)"
| 
| Core was generated by `gnome-control-center universal-access'.
| Program terminated with signal 11, Segmentation fault.
| #0  0x00007f0e46456990 in ?? () from /usr/lib64/control-center-1/panels/libuniversal-access.so


Name        : control-center
Epoch       : 1
Version     : 3.0.1.1
Release     : 4.fc15
Architecture: x86_64

Please gather a backtrace of the crash, using abrt (which should be popping up) for example. If you're going to be using gdb directly (as you seem to have done already), please install control-center-debuginfo.

(In reply to comment #6)

Installed debuginfo control-center and run it without metacity:

| Program received signal SIGSEGV, Segmentation fault.
| visual_bell_type_notify_cb (client=0x8ca000, cnxn_id=0, entry=0x0,
| panel=0x62e2e0) at cc-ua-panel.c:533

visual_bell_type_notify_cb received NULL for entry.

In cc_ua_panel_init_hearing():

| /* set the initial value */
| entry = gconf_client_get_entry (priv->client,
|                                 "/apps/metacity/general/visual_bell_type",
|                                 NULL, TRUE, NULL);
| visual_bell_type_notify_cb (priv->client, 0, entry, self);

And entry->value segfaulted.

I guess removing metacity causes the gconf_client_get_entry for 
"/apps/metacity/general/visual_bell_type" to return NULL.

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