I am presently in front of a Balance 20, HW ver 2, FW 7.0.0. Two Pepwave "mini" APs (FW 3.5.4) were connected until about three days ago. On the Dashboard | AP Controller Information page the controller reports "Access Point [sic]: 2 (Online 2)."
This is not true. While two access points had recently been controlled by the Balance, only one has been in use for three days. Should be "(Online: 1)." Apparently the Balance does not know how many APs are actually connected.
This is not a serious issue however it might be a good idea to correct it in a future firmware rev.