I have the same issue. I haven't related it to printing vs non printing layers but now that I think about it the file I have the issue with has non printing layers.

But get this I work in a graphics shop and I have my artist open the file in illustrator cs6 and he doesn't have the same problem. And I know I didn't have this issue yesterday. It just "sprung up"

I also have the issue with printing layers it is not isolated to non printing layers.

I am having no problemon Lion but it does sound like a bug or conflict. the question is what manifests this to happen.

I wonder if it starts to happen after they open the print dialog for that file? Or related to a rip or a printer driver conflict?

Although this sounds like a bug to me even though I can't reproduce it.

This is an issue with Arial and non-printing layers. If you have the open type version of Arial deactivated and a nonprinting layer (which is indicated by an italic Arial) all the layers will show up wonky beneath that non-printing layer.

I have repeated this bug over and over using Font Explorer X. Deactivating Arial causes the layer panel to break, reactivating Arial makes the layer panel work normally. The workaround is to activate Arial and make all layers "printing layers" and simply hide them.

I have attached screencast.

http://cl.ly/262f0M290y3P

deactivate all but your system fonts and see if that resolves the issue. Make sure all system fonts are active.

I was having this same problem and Verdana font was the issue for me. When I activated Verdana the problem went away.

Hi all,

I was having the same issue, (the minute I set a layer to non-print, it's name in the layer panel disappeared).

Activating Verdana full time seemed to help. As posted earlier, I am a pro-user, therefore I also use font management (Suitcase Fusion), setting Verdana to "Permanent" fixed the UI bug.

Thanks!

What’s new in Suitcase Fusion 4

What’s new in 15.0.5

This release addresses an issue that caused fonts to be unavailable to the Extensis auto-activation plug-ins and font panels in Adobe applications. For more information, see this Knowledgebase

Sorry Carson_nl

Can you explain your issue again briefly then?

If I'm reading you correctly,  you're still having an issue with setting layers to non-print.

Yes, that's what I thought. So yes, I found in my case, that it was indeed a font issue. When the correct fonts were permanently activated, then I was able to set layers to non-print, but still be able to read the layer name.

The font in question was Verdana.

Sorry I can't be of any more assistance.

Microsoft Office 2011 is the cause of problem as soon as you install, it will make Ai to act, it is replacing Verdana to MS 5.02 version of font and kills the itlic Verdana which AI is looking for. Here is what I did to fix the issue and it worked. Remove Verdana fonts from Hard Drive > Library > Fonts folder. From the Finder select Finder > Secure Empty Trash. Use Apple's Font Book to look at "All Fonts" and search for Verdana, then right-mouse click on "Verdana" and select "Enable 'Verdana' Family." Quit Font Book. Note : if you have a third party fonts management software like Suitcase please make sure it is activated permanently. Verdana is in apple system font . Good luck .