We had a very weird issue today with a SharePoint publishing site. Some js and css files (which were deployed as part of a WSP) were not updated in the publishing zone.
When checking from the authoring zone, everything looked ok: the latest file was published and approved (was v1.0 since it was deployed as part of a solution). In the publishing site though, for end users, We were getting an older version of the file.
Tried clearing browser cache, close and open browser, use in-private browsing, resetting IIS, restarting server, restarting client machine, nothing worked.
After a lot of investigation and trials and errors, the issue turned out to be caused by the BlobCache. When we disabled the blob cache in the publishing zone, latest files started to work fine. With Blob Cache enabled, we were getting an older version.
For some reason even flush cache powershell command didnt seem to fix this issue. We had to disable the blobcache in the web.config for the publishing site and then manually delete the blob cache files. We then enabled blobcache again and things seemed to work fine.
More details about the nuts and bolts of BlobCache (long but interesting read) can be found at: https://sharepointinterface.com/2012/03/12/do-you-know-whats-going-to-happen-when-you-enable-the-sharepoint-blob-cache/
Emad's Blog 
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