If I list the installed ipsets with 'ipset -n list' additional ipsets with 
the suffix 'v4' are sometimes listed. From what I can see this additional 
'v4' list is the same size as the set without the 'v4' extension.

For instance: with just code AR selected with location-block.cgi:
 
[root(a)ipfire-dev2 ~]# ipset -n list
ARv4
AR
(code AR id duplicated)

if I add code AT to AR and list the sets:
[root(a)ipfire-dev2 ~]# ipset -n list
AT
AR
(as expected)

and now add code AW to the other 2:
[root(a)ipfire-dev2 ~]# ipset -n list
ARv4
AT
AR
ATv4
AW
(now codes AR and AT are duplicated)

I see this effect on both my core 167 boxes and wasn't aware of this problem 
before my upgrade from core 161.

Rob