Are you on Windows? If so can you try running .\petsitting.exe --verbose from the command line and see if there's any output when this happens? Alternatively could you try doing .\petsitting.exe --rendering-driver opengl3 or ./petsitting.exe --rendering-driver vulkan? If none of these work could you give more details on if this happens on the main menu or only after pressing start, and what your hardware specs are?