Hi Vincent, I'm not sure, although our problem seems to be a caching problem too. But I'm not as familiar as needed with the xwiki code base to judge it right. Some points why it couldn't be the same problem (pessimistic view): - We are running XWiki 3.4, the HiddenDocuments were introduced in XWiki 4.0 RC1. - the problem isn't affecting administrators, but it gives guests all rights (Delete, Admin, etc) until the cache is flushed forcefully. Or why it could be the same problem (optimistic view): - restarting tomcat solves the problem (similar to flushing the cache) - maybe the crawler triggered some other actions which leads to an corrupted cache state. Maybe there is an second query started elsewhere? But I guess the mentioned workaround can be a solution though, because it changes the fundamental behavior of loadXWikiDoc(). I think we will give XWiki 4.2 a try when its released, and I will cross my fingers :) But anyway, some word to allay my concerns (pessimistic view) and why they are maybe wrong? Greetings and thanks to your response. Jan -- View this message in context: http://xwiki.475771.n2.nabble.com/severe-trouble-with-web-crawlers-tp7442162... Sent from the XWiki- Users mailing list archive at Nabble.com.