AutoCAD 2010/2011/2012 DWG Format

[#1]

I have a drawing with visretain set to 1 which has an XREF attached. When I freeze any layer, save, then reopen the drawing that layer is still frozen as you would expect. When I freeze a layer with a name consisting of the @ character, save and then reopen it that layer is no longer frozen. The drawings are supplied by an external source so I cannot just rename the layer as I will receive updates during the course of the project. Any ideas of how I can get round this? Is this a standard system function or is it a software error?

[#2]

Communicate with your supplier and explain that non-alphanumeric characters is layer names cause problems.  That's really the bottom line -- limit layer names to alpha numerics, hyphens, and underscores, and things work.  Add ampersands, 'ats', colons, tildes, etc and things will start to fail .

[#3 · Accepted solution]

Hi John,

As JGerth said it, layer names should be chosen with care and shouldn't contain characters such as the following examples. (< > / \ “ : ; ? * | = ‘)

That been said, could you provide a copy of the affected file (or part of it) for analyses?

[#4]

As I said in my original post, I realise that the @ character is the cause of the problem, however as I also mentioned these drawings were created by an external company and we cannot change them. I cannot control the supplier of the drawings and was hoping for a workaround which I see now is not going to be possible.