I found quite strange problem and no discussion about it. When I try to import course data from other course, (My Moodle ► Administration ► /span>/span>Import Course Data) I get a page, where I can select which parts (modules) of the course I want to import. In the upper part of the page, there are two All/none links - the left one works, the right one has no funciton. If I look to the similar page in "Backup" - I see that there should be possibility there to includ or not to include module date.
Usually it is not necessary to include course data, but for wiki modules (both ewiki and nwiki it is necessary and if I do not include module data, I get blank page.
Where is the problem?