Mesh dissapearing

[Joshua_Halliday]

Is there any reason why mesh’s in my rhino and grasshopper disappear when this area function function is being enabled?

Have I just stumbled into a weird bug, or is there some display setting that I’ve accidentally toggled?

I’ve also gone through all my script, and this is the last function that when activated hides all the meshes.

[michaelvollrath]

I don’t have that issue on my end after just testing.
You do have Selected Preview only enabled:

I don’t think that’s the issue though based on your screenshot since you don’t appear to have anything selected.

Can you upload just that portion of your script with the mesh internalized and we can see what’s wrong?