Hi Jan-Philipp, I'm investigating this issue as we have also seen it in another wiki environment and seem to be able to getting close to more regular reproduction. Have you seen the issue again on the latest XWiki version that you are running (4.4 if I'm correct) or have you rolledback to XE since then ? Any information about the specific situation that your install is experiencing when you are having this issue would be helpful or specific version you have seen or not seen the issue. I saw in a previous email you mention upgrading from 3.1 to 4.2 and in another mail you mention running 3.4 Could you list me the versions of XWiki where you've seen the problem and those where you haven't seen it. This would allow to make some code comparaison and see code changes that could impact this area. We also have made a patch which could allow detecting the issue and dump more information in the logs as well as workaround it. If you are willing to we could see to have you install that patch on your version and see if you get some logs that could be helpful. http://jira.xwiki.org/browse/XWIKI-8046 Ludovic 2013/2/8 Vincent Massol <vincent@massol.net>

Hi Jan-Philip,

What would be nice is if you could apply the workaround defined at

http://jira.xwiki.org/browse/XWIKI-8046?focusedCommentId=71549&page=com.atla...

and let us know if that fixes your issue.

This will have 2 benefits: * We'll know it's the same problem * You'll have a patch for your issue till the issue is really fixed in the core

Thanks -Vincent

On Jan 18, 2013, at 11:41 PM, Jan-Philip Loos <maxdaten@gmail.com> wrote:

...

We upgraded to the latest minor versions as they were released, first migration was from 3.1 to 4.2, followed by 4.2 -> 4.3 and finally 4.3 -> 4.4

The problem still occurred with 4.3 (4.4 is to new to figured it out now). In the last 3-4 month the problem occurred round about 3 times. I wrote a small script which compares the name of the header image. If the name is not the one customized in the XWiki.DefaultSkin it notifies me with an email.

Notable: When the problem occurs its tends to occur on the same weekday - Wednesday, but not regular every Wednesday. I checked all system crons and xwiki scheduled jobs, no one was triggered at the same time the problems occurred. The rate seems to be lower than before, but I guess it's only because the crawler isn't as active as before and we have less visits per day.

To outline it once more: - When I flush the cache manually with the Admin Tools extension, the subwiki is immediately restored. - The state (e.g. the header) is not the one from the main XEM-Wiki, its the default one - The content of the wiki is still present, "only" the styles and sadly the rights seems to be the default one

We consider to switch now back to XE, in hope to get rid of the problem. But this seems not as easy as I hoped. Currently XEM is not super essential for us, but it will leave me sick behind not being able to solve the problem.

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