cubase not finding battery

Hi Please help!!!

This has suddenly started happening.

Open Cubase (elements), load track, battery 4 is not there.

I try reloading battery 4 but it still is not there. As though cubase has failed to find it. The track is there, all the note on GM Drum Map. But no battery 4

I would really appreciate any help, its bugging the shite out of me!!! If I restart sometimes it comes back and sometimes not!!! This time it has not reappeared after the fourth restart so I am asking you guys out there…

Just to say this happens on all the tracks I open not just one.