Thank you for your post, and I apologize for the late reply.
Are you able to access the file via fmnet:/<hostname>/<filename.fp7> ?
Is it just this one machine that is unable to see the hosted files? Or, does this occur for all machines?
Any other information you can provide may be helpful.
If you have since found a solution, please post here so others can benefit.
Yes it only occurs on one computer
Sounds like it might be this issue: FMP installer does not install server.pem file
This is one of many acknowledged bugs that can be found in the Known Bug List here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html