Scrape file parameters in basic version 4.0

:?: I just upgraded from v3 to v4 of screen-scraper basic and now my scraping session doesn't work because there are no "Parameters" and I can't re-add them.

Clicking "Add Parameter" changes the width of the columns but doesn't actually add anything.

I need to submit some values by POST to log into the site. Why have parameters stopped working and is there an alternative way to do it in the basic version?

Thanks.