Check FMJ lib for revision
Spark 2.5.8 was using JMF for multimedia. This was removed in favor of FMJ during the initial phase of 2.6.0 by cstux. Please check the version used in 2.6.0 final with respect to the current FMJ status. Maybe thar's the reson for poor audio quality for PC2PC that is reported in the forum.
Mass closing of all bugs resoved during 2.6.0 and 2.6.1
old project is old