Didn't see a post about it yet, so thought good idea to put it up in case any missed the news.
Hopefully will be sorted out without intervention, but basically if you made VISA transactions at Woolies on March 11, 12 or 13 you may find you've been charged again by Woolies for the same transaction.
Supposedly will be sorted by tomorrow morning and transactions reversed, but worth keeping an eye on it. Too bad for those whose accounts are overdrawn because of it though.
This article seemed to have the most useful info.
Hitting paywall, use google cache
Crap link, behind a pay wall.
Does this impact if you paid by MC?