I have now found half an hour to search the Atlas Games Forum and look up old threads. Here's an interesting one: wards and penetration, how to make it work? .
To facilitate reading it, I reference a relevant post by John Post from its middle, which summarizes Berklist: wards and penetration, how to make it work? - #76 by John_Post . There we find
John Post:
Anyway, as David Chart has stated, the issues with AotH and Wards are too big for simple errata and any fix requires a new edition or ArM5 RE.
By reading the entire seven page thread, everybody can judge the discussions on the 2005/2006 ward snafu himself, and draw the conclusions for his campaign.
Cheers