Hello,
During few days I've a problem with openser 1.2 and radius authentication but I just solve it !
This is a little note about my method. Please,  you're welcome to check and comment it for a better solution.

Issue : Radius authentication fail for openser 1.2 but not for 1.1.1 version with the same config.
Description : freeradius server sucess (Sending Access-Accept in log) but it's not good in openser log.

Search method : analyse of differences between 1.1.1 and 1.2 version
>lsof | grep radius | grep -v radiusd

openser 1.1.1 :
openser   6226       root  mem       REG                8,2    50984    1333396 /usr/lib64/libradiusclient-ng.so.2.0.0
openser   6226       root  mem       REG                8,2    71642   30076344 /opt/openser-1.1.1/lib64/openser/modules/auth_radius.so
openser   6226       root  mem       REG                8,2    41637   30076357 /opt/openser-1.1.1/lib64/openser/modules/group_radius.so
openser   6226       root  mem       REG                8,2    43683   30076346 /opt/openser-1.1.1/lib64/openser/modules/avp_radius.so
openser   6226       root  mem       REG                8,2    38171   30389824 /opt/openser-1.1.1/lib64/openser/modules/uri_radius.so

openser1.2 :
openser   6299       root  mem       REG                8,2    50952    1333316 /usr/lib64/libfreeradius-client.so.2.0.0
openser   6299       root  mem       REG                8,2    76493   30356347 /opt/openser-1.2/lib64/openser/modules/auth_radius.so
openser   6299       root  mem       REG                8,2    41769   30356361 /opt/openser-1.2/lib64/openser/modules/group_radius.so
openser   6299       root  mem       REG                8,2    44923   30356349 /opt/openser-1.2/lib64/openser/modules/avp_radius.so
openser   6299       root  mem       REG                8,2    39411   30076331 /opt/openser-1.2/lib64/openser/modules/uri_radius.so

openser 1.2.0 use libfreeradius-client.so.2.0.0 
openser 1.1.1 use libradiusclient-ng.so.2.0.0

my solve method :

>cd /usr/lib64/
>mv libfreeradius-client.so.2.0.0 libfreeradius-client.so.2.0.0.old
>ln -s libradiusclient-ng.so.2.0.0 libfreeradius-client.so.2.0.0