Hi, Dorothythul, The steps we found to repeat this issue is that download and install this head pack while CC3 was running, and then use the Magda head right away. Since the Content Manager of CC3 didn't refresh after the new content installed, so that it couldn't find the slider. But in this case, if you close and restart CC3, the problem should be gone. Please help to confirm is this your case? Reallusion