Hi mate, sorry for that. Does the preview window still look like this after restarting D5? If yes, can you send this scene to us for troubleshooting? support@d5techs.com
Hi, sorry for the inconvenience caused by the problem. Please show us the detailed hardware information and versions of D5. Does it happen even to the empty scene? Can you update the GPU driver and check the result?
If this still happens, please send the scenes and log files to us for troubleshooting support@d5techs.com