Before I get some of the standard suggestions here is what I have verified:
All of the layers in my drawing are unlocked.
The Layer Isolation command is not currently being used.
I have a small food service equipment xref in the drawing but the rest of the drawing is not x-ref'd.
Transparency is set at 0.
My drawing plots off normally but EVERYTHING (including xref and line work within drawing) appears faded on the screen.
I have closed and reopened the drawing and it still appears faded like when you isolate your layers.
The only cause I can think of is that I was editing a xref and closed the drawing before i closed out of the xref (food service equipment).
Any suggestions would be appreciated. My drawiing is editable but just looking at it in this faded state is annoying.