[Opensymphony-oscache] cron expression - not working properly

I have a jsp that caches content according to the following cron expression:

<cache:cache cron="45 06 * * monday" scope="application" refresh="<%=refresh%>">

(where refresh is normally false, unless the cache is being cleared - when it will be true)

This works up to a point. If I login to my application, and load the page for the 1st time, the content that is supposed to be cached is cached. If I visit other other parts of the application and return to this cached page, the content is still cached (by the app not the browser).  If I allow my session to expire - for example, I leave myself logged in overnight then try and visit parts of the application from the same browser window the following morning, I'm re-directed to a login page (session timeout parameter). 

The problem: Logging back in, I find that the cached content is not used. The application re-creates and re-caches it. In the logs I see the following:

11:20:27,125 DEBUG [AbstractConcurrentReadCache] - get called (key=/reporting/visits/page.jsp_GET_1)
11:20:27,126 INFO  [CacheTag] - <cache>: Cached content not used: New cache entry, cache stale or scope flushed : /reporting/visits/page.jsp_GET_1

Anyone have any idea what's wrong?

Thanks,

Edward

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