System Information
Operating system: Windows 10 64x
Graphics card: Geforce 1070

Blender Version
Broken: version: 2.80 (sub 39), branch: master, commit date: 2018-12-28 11:37, hash: a4e4d9f0ab89

I have set a plane as a particle system emitter and used an object for the particles.
It works fine if i try to replicate on a startup scene..

But on my scene, i have no idea of what happened.. The particles are not beeing rendered.. They show on the viewport (Solid and eevee), but when i click to render, the particles don´t render. It happens on Cycles too.

It was rendering when i was "touching" the scale size. i didn't even had to change to scale. Just click there and hit enter. But it would render just that frame. When i change the frame, it would't render again. I tried reopen the file, and now it won't render at all.. Copying everything to a black file doesn't work either...

I copyed the particle system to a clean scene. it still have some issues... some frames it renders.. some frames it don't.. :

Btw.. you will notice the emitter plane became invisible on the viewport.. no settings set the change it's visibility..