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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