Hi @MichaelH55 ,
Could you please submit bug reports for these issues if you’re still affected by them? Ideally with reproduction projects attached that demonstrate the issues.
As the title says, from 2021.2 b0 onwards (previous version ok), the project view of the Editor shows the thumbnails as empty greyed boxes (when set the size bigger than zero or icon’s list).
I’ve found that this could be related first to material shown empty, so then the meshes and the prefabs are also empty or transparent.
However, it has to be with the refresh of the windows because it’s not empty/transparent for all. I can’t find why for some of them work ok, and some wrong.
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I’ve found that the URP default template fails the same way.
Create an empty new project in URP 3D.
Browse in the project view to prefabs or models folder, look the thumbnails.
Please note that the preview 3d model on the inspector is shown correctly.
Hi @gasparweb , @MichaelH55 ,
We’ve managed to reproduce the issue and are tracking it here: Unity Issue Tracker - [HDRP] Material and prefab thumbnails break on SRP projects with HDRenderPipelineGlobalSettings errors (link might not work yet but will in a couple of hours)
Edit: the issue above seems to be specific to HDRP. There is a similar issue on the URP side which is being tracked here Unity Issue Tracker - [URP] Preview of Assets do not show in the Project window
The team is looking into it.
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Thanks a lot
I have this problem for few months now since I upgraded my project to URP. Learned to live with it because I needed to finish my project, in my case there is not a single thumbnail working properly and inspector preview shows scene camera view.
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Sorry to be that persistent.
As the tracker says, the bug could be solved in 2022.1.
That is a long (very long) time from now. There is any workaround to this bug in the current 2021.2 version? Or the solution will be applied to previous versions?
For my surprise, this bug doesn’t seem to be very popular in beta users but is a total dead end for me at level creation because there is no way of knowing the graphical shape of the prefabs before placing them on the scene.
Also, all the prefab painters/spawners on the Asset Store (at least the most popular) are now broken because they use the same API to get the thumbnails.
Any help will be much appreciated!
Any update on this issue?
Bump! I’ve been looking everywhere for a solution for this. Shouldn’t it be a big deal? I don’t know how anyone is expected to browse thousands of assets without preview thumbnails!
The issue is still being investigated: Unity Issue Tracker - [URP] Preview of Assets do not show in the Project window
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I’m glad that the new issue is different than the old one and says it must be something with the material.
Standard prefabs share the same behavior too. I’ve got a single prefab, out of 400, that is visible in the project window… And I can’t figure out why it’s different from the others. Maybe I found the Chosen One and I need to bring it to the Oracle 
Anyway, as it is right now, it’s impossible to use the editor to create a scene following a standard workflow. Is it something that happens only to a few projects or every one of them has the same bug?
I hope that the Unity team has tried at least to open a project before shipping this beta, but I’m curious on the scale of this bug.
We’ve got the same problem & it’s really slowing us down. Can get the thumbnails back by modifying the materials, but they always vanish again after any other changes in the folder (adding a new material, etc.)
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I have this issue in 2021.1.22 as well. Some work, some don’t.
Does anyone know if this has been resolved yet? im on 2021 0b14 and still have it… its bringing my productivity so a complete stop.
This bug fix was merged 5 days ago.
https://github.com/Unity-Technologies/Graphics/pull/5778
I’m one of the people waiting for the fix to be released.
Can anyone predict when it will be released in 2021.2.0b?
If you don’t want to wait for the next vendoring update, you can already test the fix by updating the package manually:
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All I can say for sure at this point is that it won’t be in b16.
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