I’ve been having exactly the same problem – submit button greyed out in compressor, etc. – but I’ve managed to fix it.
Go to System Preferences and select “Sharing” Down the left hand side of the pop up box is a list of things you can decide to share. If you click on File Sharing, to the right of the list FTP Access : On will appear and in there is your computer’s IP address e.g 10.1.8.6. Make a note of this number.
Open Compressor and go to Compressor > Preferences. At the bottom is a box headed: Enter IP addresses or ranges for manually selected computers; click the + bottom at bottom left. Put in the name of your computer and the IP address you made a note of. Then say OK.
When you open Compressor again and put a job in and press the submit button, lo and behold, in the drop down box, the Cluster now says “This Computer” and the submit button is no longer greyed out – BINGO!!!
Well, that’s what I did and it worked for me. Good luck, guys.
Fingers Lee