We have now released Prince 11.3, a maintenance release fixing a deadlock that could affect Prince in some circumstances when running under PHP 7 / Apache.

We encourage all customers using Prince with PHP to upgrade.

@mikeday are there any other changes than the deadlock fix for PHP?

Just the fix, and we added a debug script to help us figure out similar issues in the future.

It's possible that the problem could occur in other environments, but so far we've only seen it in the specific situation of running PHP 7 under Apache with mod_php, which for some reason blocks signals.