Hello.
I have completed the Urban Operations mission pack's campaign, and would like to try the custom missions (terrorist hunt etc).

I click the Custom Mission option on the main menu, select the mission I want, and get taken to the planning windows, and can make my selections (team, gear, mission plan etc) as usual. But when I click the "Execute Mission" button I get taken back to the main menu. This happens every time, it is a loop.

What can I do?
Thank you.