Pixel mapping problem

I'm following the workbook for the Expert Topics Virtual Media Server, and everything is fine up until the playback exercise. I have 511 & 512 at full and all the libraries and files are empty in ML controls. 

If I put 514 at full then I get some options to use on my pixel map under File, but it's completely grayed out and empty with channel 512.
I've tried learning pixel mapping before and I remember that there were loads of options at the time which I can't find now. 
Any idea what might have gone wrong?

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