I have had an FMC freeze whilst in a hold at POL VOR near manchester. Once I hit exit hold then nothing happened in the FMC. Also the magenta line for heading select no longer appears on the ND. The simulation is still running but when I hit the menu button on CDU, there is no option for FMC. It has totally disappeared! Any ideas? Thanks Edit: actually the whole ND has frozen and will not update. Edit 2: I have installed the hotfix earlier today.

Sounds like the freezing bug most people are having. Have a look at the hotfix in the stickied post.