Scripts break all of the time when new versions of mIRC come out. It's just the way it is. It's not mIRC's fault (unless it's a bug) and it isn't mIRC's job to fix the issue. It's the script author's responsibility or else other people who want to edit the script themselves.
If the PnP people know what the problem is (ie. what was changed that broke PnP), then they shouldn't have any problem fixing the issue. If they are claiming it's a "known issue" that is a bug in mIRC rather than a valid change in mIRC, then they (or you) should explain what the problem is and I am sure someone here can offer a fix and/or a workaround to the problem.
