Icon Preview Problem in Finder

Hi,
I've had my new MacBook for about a month now, and as my photo collection has grown I'm starting to notice that while using CoverFlow (which I have as the default view for most of my folders), there are always some icons that appear as a generic JPEG icon instead of having the image preview. This problem goes away (all icons have previews) once I open the same folder again or refresh it somehow (for example by selecting Calculate All Sizes in View Options). However, once I restart/log in again, it happens again. Most of the images are normal JPG's from the web, and which ones have missing previews is completely random. This applies to all of my folders, and I've seen the same thing on several other Macs as well (the family iMac and several others in Apple Stores). This only appears in CoverFlow view, though.
Here are a couple of screenshots to illustrate the problem:
http://i92.photobucket.com/albums/l4/Octavarius/Screenshot-IconsinFinder.jpg
http://i92.photobucket.com/albums/l4/Octavarius/Screenshot-IconsinFinder2.jpg
Does anyone else also experience this issue? Is it a common issue? The Show Icon Preview option is checked, by the way.
Any ideas?
Regards,
Jacob

Keep in mind that it's the icons below the Cover Flow section that are the problem. The blurry photos in the Cover Flow section on the first screenshot have very small resolution, that's why they're blurry, but if you look in the second pic, you'll see some others that are completely sharp. Just in case you misunderstood.
I do sometimes get blurry pictures in the Cover Flow section, just after they're downloaded, but once I log out and back in, they're fine and stay that way.
Once I click Get Info on an icon that's missing the preview it's immediately refreshed and the preview is there again, as it should be. It seems like Finder is sometimes skipping certain previews the first time you open a folder since log in.
What did you mean by custom icon? How do you set/delete one?
Message was edited by: Jacob Matheus

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