Inability to access attachments in EndNote 7X after attempting to Sync with EndNote Online.

Last week, I attempted to sync my EndNote references on my personal desktop computer with EndNote Online. While I managed to open an account and go through the required steps, this ultimately failed as no references were shown in my EndNote Online. I can live with this, but a side effect of doing this, seems to be that subsequently any attachments I have in my EndNote file on my desktop have changed to have the nasty cross on them and I can no longer open them.

I think that to open any attachments, my EndNote.enl file needs to have the same name as an file (although I’m not 100% sure how this works) but I’m thinking this is not the problem here, and I don’t know what is. Any help would be greatly appreciated.