(It sounds like you have Dropbox installed on the actual server. If that is the case, disregard...)

Dropbox is doing away with allowing you to publicly share docs, so now/soon one can't use Dropbox for hosting static websites anymore.

Yeah, that's one of the issues I avoid by directly hosting the files, instead of using them as a web host. I'd use Neocities if I didn't have my own server. (My server is just my old gaming PC, on my home internet.)