The JSPWiki importer created a page with the following title:

MietteitÃÃÂÂÃ

which confuses Confluence and causes all operations on the page to fail. The page can be viewed but renaming, deleting, moving etc complain the page does not exist. Would it make sense to use some page-specific ID link on the operations regarding the page instead of the page name as an identifier? That would guarantee operations won't fail if there's a problem with the page name.