Rails - Feb 2006 - acts_as_taggable Generating Funky SQL

I am using acts_as_taggable in my application and on the tagging side of
things, no problem at all. Running edge Rails and PostgreSQL 8.1.

I am then trying to find all my AR objects with a certain tag. The tag is:
lasvegas and I know that there are at least 3 records with that tag.

So, I''m doing this:

@lists = List.find_tagged_with :any => @search_string, :separator =>
''+''

The problem is that the SQL generated looks like this:

SELECT lists.* FROM lists, tags, taggings WHERE lists.id taggings.taggable_id
AND taggings.taggable_type = ''List'' AND taggings.tag_id
= tags.id AND tags.name IN (''anylasvegas'',
''separator+'')

See what''s right after the IN clause? It says
''anylasvegas'' - why? BTW,
using ''lasvegas'' returns the correct results.

I used the :any symbol in the finder per the instructions and all the
permutations I tried to get rid of it just gave me syntax errors, etc...

So, am I doing something wrong or what?

Thanks,
HH