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I haven't read this entire thread, but no doubt my experience today is more or less what others have seen. This morning I did my first serious bout of working after installing Leopard. This involved multiple downloads from Safari, and also changing files in my documents folder (which I have stacked) and a media folder (also stacked).

After about 10 minutes, it was total confusion and chaos. My downloads folder, which was just an empty blue folder, changed with everything I downloaded. To make matters worse, I started work on some media projects, which meant files in my stacked media folder started being created. The file types were of the same kind as the ones I was also downloading, so I quickly had these two folders switching between about three different file types. I had no idea whatsoever which folder was which. I was then using Stacks to open various downloaded files and media files, and I was totally muddled in a few minutes.

Then I started filing stuff in documents, as I do, and that folder icon began changing, again to match the other two folders due to the alphabetical file names I was using.

So in the end I had three stacked folders, each of which was alternating between about three different icons for three different file types.

In Tiger, it didn't matter because I just used hierarchical menus and I could see instantly which folder was which, because I had custom icons.

Now it's just a confusing mess!
 
Or just create a folder with a symbol or letter A or something as the title. The folder will be in front.
If I want a stack not to change appearance based on its contents, I put an alias of the folder into the folder and add an @ to the front of its name. For example, I have an "Apps" folder with aliases of my most-used applications. I put an alias of Apps inside Apps, rename it to @Apps, and put the Apps folder into the dock. Now the Apps stack always looks like the Apps folder.
 
Here's a tip from another forum (thanks vertigociel):
If you want to disable the standard icon view of stack icons to make it look like a folder again this hack out:

I also managed to get it to act as a folder - if you change the "tile-type" string to "folder-tile", it'll show up with its own icon in the dock, like so:"
Where would I change "tile-type"? I like to keep folders for Applications, Documents and Pictures on my Dock. Will they retain a static icon and open in Finder with this hack? For now I'm using aliases, but it's not perfect...

[Found it. com.apple.dock.plist]
 
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