This is what happened recently on one of our drupal 7 website:

Problem:
Content body (node description) disappeared for all content types. Content body was present in the database but it was not displayed on website.

Solution:
After lot of debugging and searching we found a related post: http://drupal.org/node/989540

Hence I fired below queries:

UPDATE node SET language = ‘und’;
UPDATE field_data_body SET language = ‘und’;
UPDATE field_revision_body SET language = ‘und’;

We were not sure how we ended up with this problem, but it might have to do something with locale module. But above queries fixed our problem

Hope it helps.

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