Impossible to assign a texture in materials.

Hello everyone,

I have a big problem, I can not assign any texture in materials (masters or instances). This is impossible to drag, select via the roll menu or use the little arrow to directly assign it. I already got this problem on the beginning of the 4.16 but he resolved itself with the update. And now 4.16 and 4.17. I have no idea of why it happens.

Thank you in advance.