weight painting cursor stays at origin

[forton]

I'm trying to paint envelope weights but whatever I do the cursor's circle stays at the origin and no painting happens, it started very suddenly, maybe I pressed the wrong button at some point? it's only with this object, it works on others in the same scene.

[Helli]

Got no idea, just guessing.

Is your object set to selectable ? Because this also would make painting not working (even if u can select the object through the explorer).