Moving file failed. Probuilder bug?

I'm receiving this error when I try to save my project:

Moving file failed

Moving /Users/bob/secret game/Temp/UnityTempFile-6e0bf4ab15c90437d82bddf6769436f6 to /Users/bob/Library/Unity/cache/packages/packages.unity.com/com.unity.probuilder@3.0.9/ProBuilder/Resources/Materials/EdgePicker.mat: Permission denied

I checked the EdgePicker.mat file and the file has read only permissions.

 

Same error.

 

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Same here! What is going on? Any word on this?

 

I've started seeing this similar issue recently also since updating to Unity 2018.2.x (Linux). My error was for VertexPicker.mat of the same ProBuilder version (3.0.9).

 

Same here. Can't save anything in Probuilder..Error only allows for force quit, cancel and Try Again (try again produces the very same error). Is there a fix for this?

 

Same here with Unity 2018.2.12 and Probuilder 3.0.9. Anyone found a fix for this ?

 

The same here.
Just changed permissions of the builder in cache folder with:

Code (CSharp):

1. chmod -R 755 /Users/muxa/Library/Unity/cache/packages/packages.unity.com/com.unity.probuilder\@3.0.9/

Then, pressing "try again" continues the process.