Chris,

I just double-checked. I have 51 Style .asl files in my "Styles" presets folder.

In Photoshop the Styles Palette Flyout lists exactly 51 Styles, then shows a horizontal rule, then lists 49 of the same 51 Presets again?

Also when I do search on my hard drive I only shows one of each file.

Mac OS 10.8.2, Latest version of Photoshop CS6.

Screenshot...

We have a winner!

That was the problem exactly.

Inside the ~/Library/Application Support/Adobe/Adobe Photoshop CS6 path there were two folders:

AutoRecover

Presets

There was nothing in the "AutoRecover" folder. I trashed the Presets Folder, relaunched Photoshop and now all my styles only appear once in the flyout menu.

However, I noticed that whan I re-launched Photoshop that it instantly created a NEW "Presets" folder in my User Library at the same location? It contains 28 of the 35 Presets folders that I have in my main Presets folder (at the same directory leve as the App). I am assuming that those are the 28 default folders that come with Photoshop CS6? However, there are no actual files inside ANY of the new Presets Sub-Folders it created - it just created a duplicate set of empty folders (like Actions, Brushes, etc.). Is this normal? Why is it there?

I actually kept a copy of that folder on my desktop and it contained no presets that were not already in the application folder Presets. I even created a couple personal presets since deleting the Library Presets folder and my new personl presets were saved into the Application Presets folder and nothing was saved to the Library Presets folder.

So I do not know what purpose the Library Presets folder serves? All I can see is that if a Preset shows up in the Library Presets folder AND the Application Presets folder,  it shows up twice in the list in Photoshop.

That would make logical sense, but I am the only user on my computer and the only one that ever logs in and now when I save a custom preset (as of today) it places the file in the Application Presets folders - nothing in the Library Presets folders for me?

So as far as I can tell my Library Presets folders it created will just stay unused.

I just checked my laptop where I had installed Photoshop CS6, but have never used it on my laptop. It has a Presets folder inside the Application folder filled with all the default Presets and Preset Folders as expected. The Library Application Support folder also has a Presets folder (I am assuming Photoshop CS6 created the first time I launched it, but don't know why); and again all the Preset sub-folders are empty (just like on my main computer now). So, I don't understand why it is creating this second Presets folder in the Library - it is not even a back-up apparently. Furthermore, I have Time Machine as a back-up source. If I wanted to create a Presets folder in a second location I could do that manually?