Hello,   Since we have the 2.5.6, I tested the Yak-52 in different contexts. First, I saw we have a new command to affect for radio COM, easy, I do it in the "simu" profil of the Yak-52 and in the "simplified" one.     The new radio command works well when the missions has those parameters:     But if we force them like that:   Then we can't use the radio anymore (the communication menu doesn't open anymore)   I didn't saw this problem with other planes I tested. My DCS is in french