I was rendering a scene, and incremented the output size to 2560x1600, precalculated the IM with a 1600x1200 resolution, loaded the IM file, and qhen I render a allocation of memory error showed up. I closed rhino, restarted the computer, reopen the scene and try to render and every texture showed gray.
I went back to the ME and discovered that all the textures were damaged, but I made a copy of it in the same folder (copy/paste) and select the copy and it refreshed alright.
Can anyone explain me what just happend?