I have just installed Lightweight Render Pipeline, and everything with the default Probuilder material is pink. They cannot be upgraded to LWRP materials via the Edit>Render Pipeline route. I have followed Gabriel’s solution here: Default probuilder texture vanishes when object is created
It worked, but I just thought I should let you know that this bug still persists in the release build, which is Unity 2019.1 and Probuilder 4.0.4.
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it’s persistent with unity 2019.3.0f1 too
Can confirm in Unity 2019.3.0f6
Do you know if they fixed this issue already?
Hi there,
that’s no bug. It’s just the same thing with Unity as usual… it’s not communicate in the right way and (still) no automation for thing like that -.-
You’ve to assign the URP Material manually.
Go to Unity Preferences → ProBuilder → Mesh-Settings and assign the PB URP Material
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Thank you so much! I was looking for this setting to change the default material to something I could actually use! 
I am currently using 2018, so I don’t think I would be able to import the preview package 
Still, that solved my problem!
Thank you, again!
That’s great! You’re welcome 
Hi @DeepShader , I tried your suggestions, however, ProBuilderMesh that is created in script is all pink. Actually, when I selected ‘Probuilder Default URP’ in ‘Preferences’, I can see those two Probuilder materials are all pink. Please help. Many thanks.
Unity: 2019.3.15f1
Probuilder: 4.2.3
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I had this same problem today. I found that changing the default ProBuilder material in Preferences fixed the issue for objects I created after the change but did not fix any of my existing geometry. I found that even though the Probuilder Default URP material showed up pink in the inspector, when I dragged it onto objects in the scene it did render correctly. Thankfully I only had a couple of dozen pieces of geometry at the time. Hope that is helpful.
Texture was manually linked, and still pink. How to fix? Installed ProBuilder + the Two URP examples.
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To fix exist ProBuilder objects. Select the ProBuilder object->Mesh Render->Material and change from ProBuilderDefault to ProBuilder Default URP
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@DeepShader , Pink Shaders!
Unity 2019.4.f31 & OSX 11.6
New Project using template “3D Sample Scene (URP)”
ProBuilder 4.5.2 & “Universal Render Pipeline Support” installed
Unity Preferences → ProBuilder → Mesh-Settings → Material “ProBuilder Default URP” [assigned]
Create new Material with shader ProBuilder/Diffuse Texture Blend
Material is Pink.