4.13.1 Material assignation issue

Hello everyone,

I am currently working on my final year project at school, on Unreal Engine.

I just started to work on it and I already have troubles with the engine, I can’t assign material to landscape and particle systems (I only tried these object type, static meshes are ok with that)
I solved my problem by creating a new project but now it is happening again with every new material, so here is the issue :

I can’t assign material to my landscape or particle system, base materials and one of my materials (created before the issue) are working, but every new one can’t be assign to the object, Unreal keep it to “None”, even if my material parameters matches working materials settings. Even with a material instance, the material slot stays in “None”.

I don’t know from where the problem is coming from, I asked all the teams working on UE4 and nobody has that issue.

I am working on Unreal Engine 4.13.1 and my computer specs are the following :
Intel Xeon E5-1620 v4
32Gb RAM
nVidia Quadro K1200

I already tried to look here, on the forums, for someone having the same problem but I can’t find anything.

Thanks a lot in advance for help.

Have a nice day.

Okay problem solved, I used special caracters in folders names (like " ", which causes Unreal to don’t understand.