I was getting errors while trying to load a save on the website with an item code in its name. I erased the item code ingame and it worked, but I also deleted my cookies at the same time after it failed to load on my attempts over the last few days.
I can't really say whether or not that was the fix unless you know for a fact you don't retain something that would matter, but I figured I'd mention it in case it's an actual bug.