I was reading recently (in a couple forums) about a problem with background processing and views using Color Fills. Autodesk acknowledged the issue and they've just issued an update for called Revit 2016 R2 Update 1, and there is an Update Release 11 available now for Revit 2015.
In the release notes they reference color fills when closing a document that uses them. That doesn't sound like the issue I read about specifically. Those seemed related to printing views that have a color fill applied but maybe that's a minor difference from the code's perspective. Hopefully this update does resolve the issue they were having. It did seem that users could avoid it (the background processing error) if they were careful to save their project, close Revit and restart it before attempting to print those views.
Download Revit 2016 R2 Update 1
Revit 2016 R2 Update 1 - Release Notes
Download Revit 2015 Update Release 11
Revit 2015 Update Release 11 - Release Notes
If you have Autodesk Application Manager installed, and if you'd like to see if it will let you acquire the updates, you can try a right-click on the icon in the system tray and choose Check Now.