During the checklist when the challenge of CDU preflight is called, the system hangs and keeps asking it over and over. What is the correct response. Then asked about flaps I say 5, green light, no response. When I say ok the clean up , nothing. Installed all the latest stuff.

'Completed' is the correct response.

 

Try re-installing the NGX and FS2Crew again; sounds like something is messed up.