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Welcome to WebmasterWorld [webmasterworld.com]!
You didn't say when your page was last deep-crawled, so it's hard to tell...
Check your robots.txt file, the meta robots and meta expires tags on the page, and your server headers to be sure you are not telling Googlebot not to request or cache your page.
HTH,
Jim
Google Update History [webmasterworld.com]
I decided a decision had to be made whether to allow viewers to see old pages or see the most up to date. I have not in any way regretted using the google no-cache tag.