I am no longer able to get aircraft to activate using the trigger action "Group Activate" in DCS 1.2.5. However, The trigger action works fine with ground units. Also, using "Group Deactivate" on an aircraft causes DCS to crash for me.
I'm not sure if this is a new bug or I got hit with a corrupt patch update. Everything else in 1.2.5 appears to be working fine for me.