[Cin] Video Transitions not locking into track?

I am using a recent git version of Cinelerra, and I notice that I cannot drop a video transition between two pasted clips anymore. So I do see the white square as placement, but the icon after it does not follow. Neither is the transition visually applied between the two clips. (I have also seen the case where the icon isn't there, but the transition happens, but not today.) -- Stefan