Audio Render problem with MC 8.6.1

(1) After having upgraded from MC 8.6 to 8.6.1 Audio Dissolve cannot be rendered (messgae: No effects found to render). Rendering between In and Out also doesn't work.

(2) If I add an Audio Dissolve AND a Video Dissolve, Rendering works for Audio and Video, but a messgae says "1 Effect to Render".

(3) If I want to have only Audio Dissolves, I have to use approach (2) and thereafter to delete the Video  Render.