grid screen reboots Roku with certain optimized images

Going round and round I finally discovered why my grid screen was killing the Roku box with a "connection closed by foreign host" message. While the images have been working fine with every other screen I've used them on (both poster and springboard) for whatever reason if one of these images in a thumbnail on a grid screen the Roku will reboot before it ever displays the screen. Later I've learned that these images have been optimized by running them through ImageOptim, as such there's something missing/different about these images that's tripping up whatever image loading routing grid screen is using. Just thought I'd let everyone know as this drove me crazy for awhile, and was pretty hard to track down why. So if you want to use a grid screen make sure your images haven't been squeezed of every last drop of info to save disk space.