Multi-camera not all cameras visible

[Margo Martin0D44]

Using multi-cam to edit football video, two of the cameras suddenly went blank, after I cut one of the audio tracks and put it in another track (because it showed a red line and nothing else worked). I have all the cameras selected in the multi-cam nested sequence. 

[Margo Martin0D44]

The 1st camera is not blank for some reason, but 2 and 3 are.

[Margo Martin0D44]

So it works now, although I closed Premiere once and loaded again and then it didn't work, now I did it again and now it works, I'm guessing it was just my computer's fault.