Version 8 - Invalid File - Links to PDFs Not Working, sometimes.

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I have a client who is having trouble with links losing their connection to files. This link:http://www.smfschools.org/download_file/view/3516/209... should take the user to this file:http://www.smfschools.org/application/files/4314/7326/1436/SKMBT_C3... but it doesn't, sometimes. For the client right now they get an "Invalid File" message when they click the first link. I'm not 100% sure if these links are new, or were there before we updated from 5.7 to v8.

walkingstick