Hi!
 >>>>> I had the same problem until set
"Prevent unregistered users from editing pages, regardless of the page or space
rights" on. 
Try this one. It helped me. :-)
Kind Regards,
Dmitry
Mon, 17 Sep 2012 02:05:16 -0400 от Ashtar Communications
<ashtarcommunications(a)gmail.com>om>:
 
  
>I've monitored the wiki for the last 3 days, and the problem is
  
recurring about once every 24 hours. Each time I
have run a cache
  
flush to no effect. The only solution I have is
to re-enter the
  
missing data each time, which doesn't seem
like a sustainable option.
  
If anyone could shed light on this or suggest a fix, I would appreciate it.
  
Since I can't seem to get rid of the problem, would it be better to
  
downgrade, or to backup the wiki and then try a
from-scratch install
  
of 4.2m3? I'm not seeing similar behavior on
my development server,
  
only the production machine...
  
thanks for all the help,
  
aaron
  
On Fri, Sep 14, 2012 at 12:28 PM, Ashtar Communications
  
<ashtarcommunications(a)gmail.com> wrote:
  
> I ran a flush on the cache immediately
after the problem recurred, and
  
> the settings were not restored.
  
  
> Any other ideas?
  
  
> Thanks,
  
  
> aaron
  
  
> On Wed, Sep 12, 2012 at 12:46 AM, Ashtar
Communications
  
> <ashtarcommunications(a)gmail.com>
wrote:
  
>> Vincent,
  
>
  
>> Thanks for the help. Answers below:
  
>
  
>>>> Email -- Admin Email and SMTP
server. The rest of the settings are maintained.
  
>>
  
>>> What other setting remains that is
not the default value?
  
>
  
>> On the Email page, the Port, Server
Username, and Server Password
  
>> always stay - only the Admin Email and
SMTP server are cleared out.
  
>
  
>>>> Page Elements - All panel
settings, reverting to zero displayed
  
>>>> panels. Metadata visibility
settings are maintained
  
>>
  
>>> You modified those and they remain?
If so the problem is not a cache issue that resets XWikiPreferences.
  
>
  
>> I modified the panel settings to
display two panels on the left, and
  
>> no panels on the right. When the bug
occurs, The "show left/right
  
>> panel?" settings are set to
"--" and the "Panels to Display" are
  
>> blank.
  
>
  
>> The frequency of occurrence has dropped
in the last day - at first it
  
>> was happening every 15-20 minutes, and
today it went most of the day
  
>> with no apparent problems. The next
time it occurs I will try to flush
  
>> the cache and see if that sheds any
light...
  
>
  
>> thanks,
  
>
  
>> aaron
  
>
  
>
  
>>> One thing you can test to ensure
this:
  
>>> When the problem happens do a flush
cache in a wiki page:
  
>>
  
>>> {{velocity}}
  
>>> $xwiki.flushCache()
  
>>> {{/velocity}}
  
>>
  
>>> And then verify if your settings
are back.
  
>>
  
>>> Thanks
  
>>> -Vincent
  
>>
  
>>>> Registration - Use Email
Verification, Active Authentication Check,
  
>>>> Validation Email Content,
Confirmation Email Content. Everything else
  
>>>> is maintained.
  
>>>> Several entire Spaces - the
wiki has a large number of spaces (~150).
  
>>>> They seem to be getting deleted
at random. I will leave the page for
  
>>>> an hour, come back, and the
link to the space homepage will have the
  
>>>> "question mark" icon
next to it. The space will no longer appear in
  
>>>> the spaces list on the
Dashboard.
  
>>>
  
>>>> Any other ideas? I'm ready
to downgrade back to 3.x - this only
  
>>>> started happening with a fresh
install of 4.2 and it's obviously a
  
>>>> serious problem...
  
>>>
  
>>>> thanks,
  
>>>
  
>>>> aaron
  
>>>
  
>>>
  
>>>> On Sun, Sep 9, 2012 at 3:17 AM,
Vincent Massol <vincent(a)massol.net> wrote:
  
>>>>
  
>>>>> On Sep 9, 2012, at 8:11 AM,
Dmitry Bakbardin <haru_mamburu(a)mail.ru> wrote:
  
>>>>
  
>>>>>> +1 vote
  
>>>>> I had the same problem until set "Prevent unregistered users
from editing pages, regardless of the page or space rights" on. 
  
>>>>>> But I don't know
still if it is a bug or a feature :-)
  
>>>>
  
>>>>> It's a bug… Fixed in
4.2M3, see 
http://jira.xwiki.org/jira/browse/XWIKI-8160
  
>>>>
  
>>>>> -Vincent
  
>>>>
  
>>>>>> Kind regards,
  
>>>>>
  
>>>>>> Dmitry
  
>>>>>
  
>>>>>
  
  
>>>>>> Sun, 9 Sep 2012
01:52:12 -0400 от Ashtar Communications <ashtarcommunications(a)gmail.com>om>:
  
>>>>>>
  
>>>>>>
  
  
>>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>>
  
  
>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>>> Hi,
  
>>>>>>
  
>>>>>>
  
  
>>>>>> It seems that my wiki
is spontaneously resetting several configuration
  
>>>>>>
  
>>>>>> settings, most notably the registration, email, and layout
settings. I
  
>>>>>>
  
>>>>>> enter information like the email server, address, and port,
which
  
>>>>>>
  
>>>>>> panels to display in the sidebar, or whether to require
email
  
>>>>>>
  
>>>>>> verification. After a few hours, I return to the site to
find that the
  
>>>>>>
  
>>>>>> panels are turned off, email registration is turned off and
the boxes
  
>>>>>>
  
>>>>>> for formatting verification emails, etc are blank, and half
of the
  
>>>>>>
  
>>>>>> email settings are cleared. There may also be other
configuration
  
>>>>>>
  
>>>>>> options being reset that I haven't found yet.
  
>>>>>>
  
>>>>>>
  
  
>>>>>> I am the only
administrative user on the wiki. It's also definitely
  
>>>>>>
  
>>>>>> not due to vandalism - exactly the same settings disappear
every time,
  
>>>>>>
  
>>>>>> and it has now repeated itself 4 times in the last 24
hours.
  
>>>>>>
  
>>>>>>
  
  
>>>>>> I'm running XEM
4.2m2 on Tomcat with MySQL. Any help would be greatly
  
>>>>>>
  
>>>>>> appreciated...
  
>>>>>>
  
>>>>>>
  
  
>>>>>> thanks,
  
>>>>>>
  
>>>>>>
  
  
>>>>>> Aaron
  
>>>>>>
  
>>>>>> _______________________________________________
  
>>>>>>
  
>>>>>> users mailing list
  
>>>>>>> users(a)xwiki.org
  
>>>>>>>
http://lists.xwiki.org/mailman/listinfo/users
  
>>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>
  
  
>>>>>
  
>>>>>> _______________________________________________
  
>>>>>> users mailing list
  
>>>>>> users(a)xwiki.org
  
>>>>>>
http://lists.xwiki.org/mailman/listinfo/users
  
>>>>
  
>>>>>
_______________________________________________
  
>>>>> users mailing list
  
>>>>> users(a)xwiki.org
  
>>>>>
http://lists.xwiki.org/mailman/listinfo/users
  
>>>>
_______________________________________________
  
>>>> users mailing list
  
>>>> users(a)xwiki.org
  
>>>>
http://lists.xwiki.org/mailman/listinfo/users
  
>>
  
>>>
_______________________________________________
  
>>> users mailing list
  
>>> users(a)xwiki.org
  
>>>
http://lists.xwiki.org/mailman/listinfo/users
  
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Kind regards,
Dmitry