Lips Editor panel will be disabled if change the length of Viseme clip by Speed function and double-click the last frame of the clip on Lips track
STEPS TO REPRODUCE 1. Launch iClone 6 2. Load a project which has Viseme data 3. Open Timeline, expand the Viseme track of the character 4. Click "Speed" button, change the length of the Viseme clip 5. Double-click the last frame of the clip on Lips track