I posted this in response to someone else having the same problem but their issue says resolved so I am not sure anyone will look at that thread.
When I go to a page in my site and click on the WP-Filebase Icon a blank screen pops up. I have the plugin installed on a test site (same wp version and other plugins) and it works fine there (screen pops up with the ability for me to add a file).
Tried this in Firefox Safari and Chrome with the same result.
Can't figure out why this is happening.