Symptoms
Consider the following scenario:
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You check out a binary large object file that contains CSS styles in its page from a document library on a Microsoft SharePoint Server 2010 site.
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You make some changes to the file and save the file.
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You select the Undo Check Out option to cancel the check out.
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You check out the binary large object file again and then save the file as a minor version.
In this scenario, the page of the binary large object file that uses CSS styles cannot be rendered.
Resolution
To resolve this issue, apply this following hotfix package:
2459257 Description of the SharePoint Server 2010 Cumulative Update Server Hotfix Package (MOSS server-package): December 31, 2010
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.