I am trying to change the cloud material but the materials are all blank and when applied it surely do say loading shaders but once loaded nothing changes and all the clouds vanishes. Only the default cloud shader work.
Do the materials have the normal nodes inside of them?
Could it be corrupted cache? Try closing the project, deleting the folder DerivedDataCache (where processed / compiled shaders are stored) and rerunning the project. Perhaps a fresh build of the shaders will fix it.
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