Grass only moves in the wind when I move in the viewport

It happened suddenly. I saved the project as save all and now the grass doesn’t move, unless I navigate using the mouse. It’s the only negotiation so far in the level that has any wind movement. I’m using 4.9.2. windows 10. The base material in the material editor still shows movement and is no different. Does anyone know why the grass has stopped moving and how I can correct it?

check if realtime is activated in viewport.

That’s done it. I must have disabled it by accident when opening the high res screenshot. Thanks

This answered my question. Thank you!