So here is the situation, I moved files on my computer in drop box and it seems to be mainly a problem with pdf's. The files are still listed on my computer with a little grey 'x'over the icon and the computer gives an error message that they can't be opened. There is no record of the files on my online Dropbox account. I recently updated from a single user to a business account and wonder if maybe the data was lost? Is there any way to recover these files.