AE camera DOF suddenly not working

Hi there,

I am having issue with camera in after effects. I dont know, what went wrong. Everything was working ok and suddenly DOF dissapeard. My composition is flat, dthere is no DOF, even when camera setting didnt change. I tried restart AE, create new project with new camera and new objects. Its The same, still no DOF. Ofcourse I tried google what might happend, but I couldnt find any solution.

I tried following things, nothing worked:

• My camera render is on classic 3D  (not cinema4d)
• My viewport is "active camera"
• I reinstaled AE, didnt help
• I deleted caches, didnt help
• fast preview is off
• after rendering comp (via encoder) still no DOF

I really dont know what to do. Please, help. (Sorry for my english, its not my first language)