If you’re experiencing rendering issues with your GPU in Vegas Pro 9.0, first ensure that your GPU drivers are up to date and compatible with the software. Additionally, try adjusting the GPU acceleration settings within Vegas Pro to see if that resolves the problem. If the issue persists, consider checking for any conflicting software or system settings that may be affecting GPU performance. Finally, reaching out to the Vegas Pro community forums or customer support for specialized assistance can help troubleshoot and resolve the rendering problem efficiently.