Open opening finder window

I think I figured it out. It's because Photoshop creates it's own preview, which appears instead of the automatically generated Finder preview. To turn this off, go to Photoshop Preferences, find the file saving preferences, and set it so it never saves previews. From what I can tell, that saves it with the border, like you needed. Also, to add a border back to an image without going back and resaving it, you can click it's icon in Finder, and then click File > Get Info. Then click the icon in the upper left corner and push Delete on the keyboard. That gets rid of the custom preview from Photoshop.

Hope this helps!

I don't know if this is relevant, but many times when I go to any kind of file dialogue or even just click on some tool or something, I get a few seconds (or more) of beach ball while my second HD (non-boot drive with most of my documents/non-OS files) wakes up and gets up to speed. I can hear it revving up and when it gets to speed the OS unfreezes… so maybe if your file directories are being cached in memory or the drive cache, when the HD wakes after 30 secs for whatever reason, it updates the directory lists in memory?

I'm thinking this isn't super common complaint so maybe it's HD settings specific like my problem (I think I set my 2nd HD to have energy saving options somewhere when I installed it and haven't found a way to have it spinning 24x7.