I have tried twice to upload an image for the November contest. Both times, it showed up in New Images instead of Contest Gallery. I deleted the first one and uploaded it a second time, but decided I'd better ask for help before repeating that effort. I did, BTW, follow the instructions faithfully. :)
All new images go into the new images gallery, even those specified for contest. They get put in a gallery called "New Images - Contest", and must then be moved to the actual contest gallery by an Imagemod. If it hasn't been moved already, I'll go do it now.