If deleting your cookie didn't work, shut down your browser and search for a file called "cookies.txt" and delete it. The file has probably become corrupted, which is why it's no longer showing the right symbols.
Shut down and reboot and search for it again, if it's still there delete it and repeat until it's really gone.
Once it's gone, come back and reset your cookie.
Spark
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Kevin Jon Schlossberg
SysOp and Administrator for BladeForums.com
Insert witty quip here