I accidentally messed up the Material Room and tried everything to get it back to the original scene. (I can't seem to get the elements to stay where I want them.  Every time I add the material element the main scene drops to the bottom and won't move.  Just a matter of not knowing the proper method) Relaunching in Factory scene mode has no effect.  I remember and old posting about a file somewhere that can be deleted or renamed to reset the scenes.  Possible under users/name?  Any help would be greatly appreciated!

I found it !!   Under the preferences I changed

the launch to Factory instead of Previous.

For future reference when you get your UI set the way you like it set a UI dot for each room as you get it arrange the way you like. I personally use several different UI layouts depending on what I'm doing.