The following worked in prince 6 to hide my page numbers from the first instance of a named page.

@page screenplay:first {
@top-right-corner { content: normal; }
@top-left { content: normal; }
}

But since I upgraded to prince 7 it no longer works. Any help is appreciated.

You now need to apply "prince-page-group: start" to the element with the named page, to ensure that it is treated as a first page. This workaround is necessary to handle situations where two chapter elements for example are adjacent, but you want to treat them as separate page groups.

Thank you.