Downloaded CSV file is empty

I have 1017 users in my database with extended fields that I created with Register Plus Redux and synced up with data I uploaded with the Import From CSV plugin. With both RPR and RPR Export activated, I tried to export Users and got the message, FILE GENERATED (1) /tmp/plugin_registerplusredux_eu_exported_users-20110802-001232.csv with a button “Download Export File”. Clicking on the button gives a dailog for saving a file named users.php, but it’s an empty file.