There is a new option in AutoCAD 2016 When the AutoCAD System Variable
XREFOVERRIDE is set to 1, you can change the Color, Linetype, Linewidth, Transparency and Plot Style of objects in the External reference drawing or nested blocks by changing its original layer property in layer palette, in spite of the legacy ByBlock rule.
How to Turn on the XREFOVERRIDE
1.) type in XREFOVERRIDE and select the <Enter> button.
2.) type 1 and select the <Enter> button.
3.) Now the option is off and the masks and text should display properly.
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