some xwiki problems.

Hi all, i encountered some problems using the xwiki and hope you can help me. i downloaded the latest xwiki version and installed everything using a postgresql database and a tomcat 5.0.29. The following problems occured: 1. The page http://localhost:8080/xwiki/bin/view/Main/WebHome could not be opened for some reason. the browser keeps loading and loading, but nothing happens, not even a timeout. The same problem exists for the "Blog" link: http://127.0.0.1:8080/xwiki/bin/view/Blog/WebHome However the page http://127.0.0.1:8080/xwiki/bin/view/XWiki/Menu can be opened without problems. Logging in as Admin user does work, too. So DB cannot be the problem. Any ideas about this problem? 2. I deleted some page in the wiki, which resulted in lots of execption that i cannot get rid of. at the moment i cannot change anything due to this problem. the exception is org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.ja va:68) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239) .... .... at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java :86) at com.xpn.xwiki.store.XWikiHibernateStore.endTransaction(XWikiHibernate Store.java:350) at com.xpn.xwiki.store.XWikiHibernateStore.deleteXWikiCollection(XWikiHi bernateStore.java:982) If you need the full exception, tell me. 3. I changed the language under "More Actions" -> "Web Preferences" from "en" to "de". After that it was no longer possible to change anything under "Presentation" the definition for the "XWiki Wiki Web", ... , "Top Menu", "HTTP Meta Information" we all empty and thus could not be edited. Changing the language back to "en" does not work, because i am getting the errors mentioned in 2.) 4. When editing a page i can select the preview, which will show me a preview of the page, which is nice. However the preview page does not contain a back button, that takes me back to the edit page. there is only a save button. so, if i do not want to save the page i have to use the back button of the browser, which is neither good nor consistent. Adding a back button in the html page back to the preview page would be really appreciated. So, my biggest problems are 1.) and 2.) at the moment. i'd really appreciate if you could help me, because i have to set up a wiki and want to use one written in java and xwiki seems to be best non-commercial java wiki. regards, Andreas ___________________________________________________________________________ Andreas Wüst amites GmbH Heumadener Straße 2 73760 Ostfildern phone: 0711-4599939-34 fax: 0711-4599939-63 mailto:andreas.wuest@amites.de http://www.amites.de