Are your graphics drivers up to date? If you are unsure I would try updating your graphics drivers just to make sure this isn't the issue.
If you then still have problems, try uninstalling Character Creator 3 and the Pipeline extensions and then reinstall the latest full version. Uninstalling CC3 will not remove any installed content so the process shouldn't take too long and you shouldn't need to reinstall your purchased content packs or custom content (making regular backups of your custom content is recommended).
Peter
Forum Administrator
www.reallusion.com