When accessing the list of parameters from the Product Type list (by clicking the [ show ] link in the parameters column, the tab label is a meaningless '[ show ]' rather than 'Parameter'.
Tested with nightly build from 24/3/2008
Extended Layout
Joomla 1.5.2
Apache 2.2.8
MySQL 5.0.51a
PHP 5.2.5
Regards
Phil