I have a situation with layers turning on, all by themselves, that I hope someone can help me figure out.

Our Drawing templates are setup with multiple layers.  Most of these layers are turned off by default.  The different layers contain different "flavors" of general tolerance notes in the sheet format, for different types of Parts (i.e. molded parts, sheet metal parts, machined parts, etc.).  Our users know to turn on the appropriate tolerance note layer, depending on what type of Part they are creating.

We upgraded from SW2013 to SW2015 a few months ago.  A user came to me with an issue, shortly there after.  He was having a problem with all of the layers turning on by themselves.  And then the drawing would accidently get printed and/or saved that way.  This would show all of the general tolerance notes superimposed on top of each other.  Obviously not a good thing.  I did some research here on the forums at the time, and found what was causing this, and what to do to correct it.  So, I made this adjustment to his machine, and he's not had any issues ever since.

Now, I'm getting complaints with this same issue from other users as well.  However, I can't remember what I had done to the first guys settings to fix it, nor can I find it again in the forums.  If I remember correctly, it had something to do with the new Layer Printing setting.  But I could be wrong.  I need to figure out what it was that I had found to fix the first guy's machine, so that I can go through and fix everybody's seat of SolidWorks.

Does anyone know what may be causing this and/or how to fix it?