Please try updating your graphics drivers as this is normally the cause of this issue.
Please see the links below to check (depending on the graphics card you have).
https://downloadcenter.intel.com/Important: If your computer has switchable graphics, please do ensure you are running CrazyTalk with the more powerful graphics card (Normally Nvidia or AMD). You can normally do this by right clicking the CrazyTalk desktop icon and choosing "Run With Graphics Processor".
Please also run Windows Update to ensure your system is fully updated.
In Windows 7 you can do this by clicking Start > All Programs > Windows Update > Check For updates. In Windows 8 go to the Start Screen and type Windows Update. Then select "Check For Update" from the search list. In Windows 10 go to Start > Settings > Update & Security > Windows Update and then "Check For Update".
Hopefully this will resolve the problem for you.
Peter
Forum Administrator
www.reallusion.com