SYMPTOMS

When I login to the BCP it states "Not available for your Admin level" and I cannot do anything.

I also see errors on the site that refers to an encoded file being corrupt.

CAUSES

One of the system files corrupted during a file upload. If you inspect your FTP client log you will see error messages, unfortunately most FTP clients hide these from normal operation.

SOLUTION

Upload the files that suffered from a critical upload error. Alternatively upload all files from the upgrade patch again.

Also ensure you have run the updater.php or other similar file - check the patch readme file for full details.

NOTES

There is a free Windows client called FileZilla that shows any errors to files during the upload process and also gives you the option to upload only the files that may have failed. For more information visit them at http://filezilla.sourceforge.net/