this sometimes happens when eZ is having some trouble with its cache directories...
eZpublish won't be able to write successfully its cache if :
- wrong permissions are set on the var directory - there is no more free disk space on your device (yes It can happen... :p)
You can also have this problem If there are some conflicts between multiple cache directory (when using multiple siteaccess or ...) Did you try to modify some settings in the [FileSettings] bloc of your site.ini.append.php ?
Hope this helps.
Arnaud
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