Rails - Dec 2005 - weird postgres adapter error

I just ported my Rails app from OSX/Linux to Windows XP for the first 
time.  I am running PostgreSQL 8.0 and the postgres-pr 4.0 adapter. 
Some of the queries in my Rails app work, but for others I get a weird 
error:

ArgumentError: Invalid Ruby/cstring: select sa.name as activity_name, 
max(sah.created_at) as created_at
      from  site_activity_histories sah, site_activities sa
      where sah.user_id = 17
      and sah.site_activity_id = sa.id
      and sa.viewable = true
      group by activity_name
      order by created_at desc
...<snip>...
c:/development/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/connection_adapters/abstract_adapter.rb:88:in
`log''
c:/development/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/connection_adapters/postgresql_adapter.rb:137:in
`execute''
c:/development/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/connection_adapters/postgresql_adapter.rb:351:in
`select''
c:/development/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/connection_adapters/postgresql_adapter.rb:118:in
`select_all''
c:/development/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/base.rb:431:in
`find_by_sql''

Obviously, I am not getting this error in OSX/Linux.  Anyone have any 
ideas what is happening?  Is there a better postgres adapter for 
Windows?

thanks,
Jeff

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