It's not a widespread issue. At least, there is no evidence that it is widespread. And by "widespread" I mean "there is a good chance you will experience this problem if you buy a LUMIX lens."
I understand that you've been lucky with the lenses you own or have perhaps not fully checked them (the blue fringing is invisible unless checked in a very specific way) but I don't understand how you can continue to believe this given that we're now in the third thread, all chock full of people who have experienced problems. And this is just a small proportion of users as I'm sure most are not frequenting DPR. To say it's not widespread is questionable in the extreme, to say there's no evidence for it being widespread is outright untrue.