Hello Everyone

I have a little problem with Meta Blobs/Clouds.
I am making a picture to be used as a background for an animation. Field of corn and mountains. The Meta Blobs are greyed out. If I open a new file they are still greyed out. If I re-start Vue and open a new file they are back but as soon as I open my field file they have gone again.
My resources are 75%. I just wanted a few clouds low over the mountain tops. It is a slightly heavy file because rendertime on resolution 640 by 426 is 4 hours on final.
Thank you very much for all the hints and tips on this forum.
Best regards

Sepia