Frozen layers re-appear in viewport set to conceptual when saving

[Stoofer]

Ladies/Gents,

 

Looking for a bit of assistance to an odd occurence with one of my drawings. I have a room full of furniture that I want to show in 3D in the conceptual style from a few different views.

 

I've set up a couple of viewports in paper space, then rotated my view to suit, went into the layer properties for each and turned off the 'walls' layer within the viewport - walls disappear in each viewport and I have what I want.

 

Problem is, when I then save the drawing, the frozen layer reappears. Checking back into the layer manager, the 'walls' layer still says its frozen within the viewport, but I can cleary see it on my drawing...

 

Any ideas on what might be happening? It's AutoCAD 2009 and I'm not using Xrefs. (It seems a similar problem can be sorted if its Xref's)

 

Thanks for your help