With the following definition in the code Prince (7.0 beta 1) seems to run forever.

<div style="display: inline-block; column-count: 2;"><table> ... </table></div>

Can you email me (mikeday@yeslogic.com) a document that exhibits this behaviour?

Thanks, this is a known bug in the beta affecting multi-column layouts inside inline blocks and positioned blocks; it has been fixed for the next release.

Prince 7.0 is now out, and includes the fix for this issue. Thanks for letting us know!