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Hello all, I have a Civil 3D drawing with an xref to another drawing. When I change the xref and update the reference in the main drawing, all the xref layers I had frozen in the main drawing viewport suddenly come on. Xref layers that are frozen in model space or turned off stay frozen or turned off after updating, but if an xref layer was only frozen in the viewport, it comes on after updating the xref. Any ideas?

I'm hoping someone can help me with an issue I'm having in my plot files. The way our office sets up our drawings is that we have a set of base files (which is where we do all our plans and details, etc), and then those drawings get xrefed into a different files located in a "plot" folder that that has our titleblock and viewports of the xrefed base files. The problem is that the plot files have started to NOT save any of my layer states that are associated with the base files. For example, I have a base floor plan that has demolition, construction, RCP layer states that are toggled with LMAN. But if I open the plot file for the RCP and set up the viewports so only the RCP layers are visible...the next time I open the drawing the RCP layer state is abandoned...now ALL the layers are on and I need to redo the viewport layer states... Can anyone tell me why this is happening? I've done this method of file organization on countless projects in the past and this is the first time this is happening. Any help is appreciated.