I have one user who started having this problem this morning. We have a few pages in our SharePoint install which link to files on our file server (a separate machine) meaning the links will point to something like "F:\COMMON\thisdepartment\thisfolder\thisdocument.docx". The F:\ drive is mapped to the file server on every machine in the office.
On any of the pages where this is done, my user will click the link and nothing will happen. If she right-clicks and selects "Open in a New Tab" it will open a new tab with the directory to the file in the address bar but the file will never load. If she right-clicks and chooses "Save Target As..." she can save a copy of the document to her machine, so I know the paths are correct, that she has proper permissions, and that the files are available.
She is the only person in the office with this issue, and there haven't been any changes to her machine or the SharePoint server since last night. I've tried rebooting her machine, restarting IIS for the site, and resetting her IE to default settings, as well as clearing the cache, deleting cookies, etc. Nothing has worked so far.
What could be causing this?