There are a number of free FTP clients out there, my recommendation would be FileZilla. It seems like an odd problem, it looks like an error with the BBCode parser or something of that sort.
Make sure you vBulletin files match the vBulletin version number in your AdminCP.
Did you complete the upgrade script fully?
Does this problem only occur with the tags? or does it affect other tags? (Like [left], [right] e.t.c.)
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