[xwiki-users] Unknown Macros after upgrade from 2.x to 3.3

Hi XWiki expert, two months ago we upgraded our internal XWiki to version 3.3. After the upgrade it happens in unregular intervals that some macro are no longer found (error message: "Unknown macro ...") . Only macros requiring programming rights are affected. When adding a comment to the affected macros as user with programming rights the Macro becomes available again. We can not see any unusal event which can be associated with the problem. The log files do not contain any unusal error message. I saw the problem also on http://rhierlmeier.myxwiki.org with XWiki Version 3.5 (Unknown Macro "spaces" in Page Main.WebHome). Storing the Spaces Makro again solved the problem. How can I debug the problem? Richard