Some updates of the OS for Windows 10 (especially in the inside program) can compromise the setting of the graphics card or monitor, the problem seems to be caused by the monitor / graphics card that is no longer able (due to a system error) to manage between the monitor's color profile and the Adobe application workspace.
If you have other Adobe Apps like Photoshop or InDeaing you should have the same problem everywhere.
If this is the case you must reset your OS after using a Windows troubleshooting tool.
Does View > Preview on CPU change it?
What happens if you place the file as a Copy? (drag from the Library holding down the Alt key).
Thank you! I will try to see if it's happening in Photoshop. It's strange because I have about 20 of these gradient illustrations and it's not happening with any of the others...just this one!
Dragging from the Library and holding down Alt worked!! Thank you!!! I wonder why none of the others required me to do that?
I don't know, but it happens sometimes.
Switching between GPU and CPU Preview helps as well as dragging an embedded copy.
In this interesting example the top window (and the preview in the library) shows the correct one.
The other 3 examples were just dragged aslinked into new documents.
Everytime I drag it into a new document it gets a different preview...
I report this at the Illustrator Uservoice feedback site: