Hi,

Have you tried to use LAYFRZ command?

Activate viewport, click on Freeze Layer button on the Layers palette, than verify settings, they should be set to Vpfreeze:

Command: _LAYFRZ
Current settings: Viewports=Off, Block nesting level=None
Select an object on the layer to be frozen or [Settings/Undo]Settings
Enter setting type for [Viewports/Block selection]Viewports
In paper space viewport use [Freeze/Vpfreeze] <Freeze>: Vpfreeze
Select an object on the layer to be frozen or [Settings/Undo] <- select object on the Layer you want to freeze here
Layer "XXXXX" has been frozen in this viewport.
Select an object on the layer to be frozen or [Settings/Undo]
Command:

Maxim