New version of GSA uses Parenthesis for multiple sets of meta-data filters.

If your Mini firmware is from before August 2008 (I think), metadata filters may now be broken. The Mini added support for parenthesis when joining multiple sets of OR'd metadata filters with RequiredFields.

Most people are not even using this functionality, but if you are, this might cause a problem for you. I will attach a reverse patch here in case you have old firmware.