I don't seem to be able to view any of my oldest routes - those with a number below 5,000,000, up to mid-2011. They just show the default starting page - zoomed into my default starting point if I'm logged in, or otherwise a blank world map without any markings. Everything since 5,000,000 seems to be working fine - both those saved to my account, and those from before that was possible. I've tried this on two different computers and a phone, and get exactly the same behaviour. Is this a known problem? Is there any way to get the old routes back?
Please try again now. I think I've fixed this problem. If not, I'll keep digging.