Hello, Greebo.
This is busa01.
Thank you for always making the great skins.
By my English capability, I may not be able to understand what you have said.
However, the problem which I have may be the same as it of you.
In off-line, material files does not work often correctly by my case.
They seem to be influenced of default res file.
When some custom skins have already downloaded, they have conflict.
Depending on the sub folder number of a skin, material files may not work correctly.
Is this information help to you?
Thank you for reading my poor English.