Revit 2013 - DWG export Color ID global change bug

I thought I got in a loop today:

1. Export DWG
2. Expand All
3. Select all rows
4. Try to delete the number in the Color ID box
5. This warning will come up:

You have to press Close for every selected row (could be hundreds) - quickest way is to hold down the Enter key until the warning goes away.