Could you please run WinSTUN and tell us what the result is in the poll above.
Please read carefully the results to distinguish between dependent filter and dependent mapping.
For those interested, the STUN software was originally developed by Vovida and the source is now available from SourceForge. You can get more information about the software and STUN in general from here.
EDIT: For those of you "on a mac": here is a command-line mac version of the program. You need to unpack the program, and then from the Terminal run
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Thanks again for your help