Xbee Pro S2 will not associate with Pro S2B coordinator. Coord using XBP24BZ7 - S2 using XBP24-ZB - -same PanID.

PanID the same
Baud 9600
JV =1 (tried with 1 and 0 to no avail
Router API (both set as this)
latest firmware versions

Check your SC value and adjust the S2B to match the S2 and you will be fine.

For the available values of SC, refer page number 133 of the following product manual, http://ftp1.digi.com/support/documentation/90000976_S.pdf