Greetings, Atomic_Skull!
Thank you for posting your concerns with flickering textures. I can understand how strange it is to only experience this with Windows 7 and Windows Vista, so I will make sure to submit the information that you have provided to the development team for a thorough investigation. I recommend keeping watch on this thread for any information regarding the investigation. I also suggest consulting www.PlayOnline.com for any possible developments regarding this matter, just in case. Thank you again for your report!