I found a fix but I am not qualified to determine if it should go in as a 
patch.

I basically added a % on each side. I think %% distills down to % without 
triggering a substitution.

http://code.google.com/p/web2py/source/browse/gluon/dal.py#1924

From:
key = '%|'+str(second).replace('|','||').replace('%','%%')+'|%'
To:
key = '%%|'+str(second).replace('|','||').replace('%','%%')+'|%%'

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