Using Filestore2 to upload .pdf files results in an error opening file.

I am using drupal 4.5.2, fscache (4.5.0) and filestore2 (4.5.0). After "uploading file" through the "create content" area, I try to read the file after it is submitted. The Adobe .pdf file cannot be viewed and I receive the message: "there was an error opening this document. The file cannot be found." I have checked the path to fscache and it is apparently correct. I have, to my knowledge properly installed both modules, including the database tables (I have verified the existence of these tables through phpMyAdmin). I have also verified the presence of the fscache directory under "misc."

In addition to these modules, I have the attachment module and filemanager module installed. The standard "upload" module is not enabled. I have confirmed that filestore2 doesn't work even with these other modules uninstalled.

Any ideas???