Viewport on Defpoints

[HLC_Fiesta]

Using AutoCAD Mechanical 2012
I have three viewports created on the Defpoints layer. I hid the layer on the plotter tab so the lines do not print. I have done this for years. I have never had any problems.

Today, I turned the Defpoints layer back on to modify the viewport sizes in a particular drawing and it will not let me select the viewports. They appear but are not selectable.

Any suggestions would be greatly appreciated.

[HLC_Fiesta]

OK, now they all of a sudden became selectable and problem is gone. I don't know what it was, I kept working on the actual drawing and happen to notice they were selectable again.

Thanks anyway.