Just a quick bug report, with Version 4.05.0.97
In the Materials tab, if you right click and copy a node, then select multiple nodes and right click saying "Paste Clipboard Material to all Selected Material" the two options "Retain Existing" and "Use Copied" seem to be switched.
If I choose "Use Copied" it retains the original node textures while "Retain Existing" makes it overwrite with the textures from my copied source.