Thanks for your feedback. Unfortunately we can't reproduce the issue in our test environment. Please check the following: Please note that the "Launch External Image Editor" button is only applicable for image photo with morph-based sprites. Please note that it does not applicable for vector-based sprites, in which the button will gray out when you select vector-based sprites. http://manual.reallusion.com/CrazyTalk_Animator_2/ENU/Pipeline/02_Sprite_based_Project/Modifying_the_Textures_of_the_Body_Parts.htm To be able to launch your image editing software you first need to setup your image editing software in CTA3 Preferences (CTRL+P). Click the Open button in the Texture Editor option and browse to the executable file of a suitable texture editor application. If the issue still exists please provide your system report for further checking and let us know which character you are using. Your help is highly appreciated. Reallusion