Hi Andrew, we are experiencing a similar problem, two of us cannot view the test or live FPS XML with ALV, but one user can.
Before I check on the authorisations, just wondered if you found the solution?
What I found was I could actually generate the test and live FPS despite the file not showing and not having the option to 'submit'.
I could then submit the FPS from t/c PB2A which is not ideal and we need this file to appear correctly within the FPS program to submit.