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15981 Views 46 Replies Latest reply: Nov 17, 2009 8:41 PM by luoenzhen
I have the exact same problem you described and, although it could be a minor problem for some people, it is killing me! The only solution I have found so far (which is not perfect) is resizing the Finder fonts from 12 to 13. That will automatically resize the icon and will make it possible for the icon preview to get back to normal, at least with Column View enabled (it didn't work with CoverFlow mode). I'm still upset and looking for a better solution, because resing the fonts to 13 makes Finder look somehow unpleasant. I'm also afraid that it was a change made by Apple to make Finder snappier and faster and not a bug as you and I presume.
PS: sorry for my broken English, I'm from Brazil.MacBook White, Mac OS X (10.6)
posted this in another thread...maybe it'll help you, too...worked for me
+did you try deleting the User>Library>Preferences>com.apple.desktop.plist, emptying trash, then restarting?+
+like I said, doing that brought back my icons (none of mine were missing from the dock, only the desktop & in the folders where the actual items reside) but dragging to the dock usually puts that item in the dock, so maybe it would work...+
+good luck!+Aluminum iMac, Mac OS X (10.5.6), 1 GB
Hi, thanks for the reply, but that didn't work for me. Everything is fine on the desktop, dock or stacks. I'm just unable to see the thumbnails for .pdf, .doc and .txt when in Columns or Cover Flow view in Finder. It only works for .jpg files. A preview appear in the sidebar when a file is selected, which is ok, but not in the icon itself like it used to do in Leopard.MacBook White, Mac OS X (10.6)
I'm having the same problem--not able to see the preview icon image of most text/html files in the column to the right of the file, nor in coverflow view--except I haven't upgraded to 10.6 (still on 10.5.8). Seems that this problem started happening around the time I updated to 10.5.8.
I tried deleting that plist file, and that didn't help. I tried enlarging the fonts to 13 pt., that didn't help either.
I also tried repairing my permissions...that didn't help either. In fact, for some odd reason, that ended up LOCKING all my files in my User account. (?) (don't know how that happened!)
Graphic file icons seem to show the preview ok, but I'm working with a large quantity of html files with pictures, and being able to see a thumbnail of that html page with the main images in them helps SO MUCH for the work I'm doing. That being said, not ALL html files are affected. Some old files (html 3.2) seem ok...but xhtml 4.01 html files and those with Server Side Includes don't show a preview at all, mostly.Macbook Pro 2008, Mac OS X (10.5.8)
I have huge archive of photos that I used CocoThumbX to create thumbnails for, including movies. All these are messed up. Either they are noise, extremely low res, or OK. So I am using CocoThumbX to delete all icons, then changing the folders to Preview Icon.
This may be happening because Snow Leopard is using QuickLook technology in the Finder views now. The good point of this is that your preview can be as large as your open window and be resized much like iPhoto. The problem is that you old way of doing things is lost. I put a lot of work into preview icons, especially for my movie files.2.8 8-Core MacPro, Mac OS X (10.5.4), 2gb RAM
I have similar problems. Preview icons for documents, mp3 files and such are fine, but I lost my icon previw for all my video files when updated to snow leopard. It was quite strange actually. I had the previews working right after the update to 10.6.0 but as I went through my folders with video files in them, the previews started dissapering. Now all I have is the basic file type icons (those that say .avi or .mov on the icon). Only video file that has icon preview is one that I recorded with quicktime 10. All downloaded videos show standard icon.
I have icon preview enabled. I tried deleting com.apple.finder.plist -file, restarted finder and updated to 10.6.1, no avail. I'm under the impression that icon previews for video files are handled by quicktime, so could the problem be with the new quicktime 10?MacBook unibody 2.0GHz, Mac OS X (10.6)
I have the same issue with my SL imac. All over previews in finder are working correctly, mp3s, PDF's, jpegs. For my its my .avi files and my .wmv files. I just get the generic icon. Why or Why? So with the last post, I also think its QT issue.imac 20", Mac OS X (10.6.1), AE + macbook
I reinstalled SL this morning and the problem persists. There must be a component on here that causes this. My MB is fine, though that has less extras installed.imac 20", Mac OS X (10.6), AE + macbook
It seems that the problem is not just within the videofiles. Yesterday I updated Unarchiver (extraction program), and now all the .rar and .zip -files show generic icon not the unarchiver icon with filetype label on them as it's supposed to be.
This really is quite irritating as I'm used to determine the filetype by the icon. Can't do that anymore. I do hope there will be a fix...MacBook unibody 2.0GHz, Mac OS X (10.6)
I was having a similar problem, trying to apply a picture I found into a folder icon.
1. Find the image you want to use for the icon preview. Save it as a .png.
2. Open Icon composer which is located at
4. Drag the .png file into the 512x512 box in icon composer and then selct it and command+C.
5. Find the file you wish to change the preview of and open the 'get info' pane
6. Click the preview icon in the top left corner and press Command+V.
The icon should change to the picture you copied.
I had to fiddle with the size a bit but it worked out well for me.MBP 2009, Mac OS X (10.6)
I have the same problem, but just for video files (.avi anyway). All other files seem ok (.jpeg, .doc, .pdf).
I tried deleting the preference file and relaunching without success.
I'm glad to see I'm not the only one having the same problem.Macbook, Mac OS X (10.6.1)
I called AppleCare today and we discussed the problem. He suggested reinstalling Flip4Mac and Divx codecs - didnt work. I told him my issue was focused on .avi files and .wmv files and that .mp4 files are okay. We went to get an .avi file and see on his computer if the preivew was there in a grid finder window. It wasn't! At first he was going to tell me this was normal until I insisted this is wrong and on my MB it still works and it USED to on my imac.
He hasn't called me back. I guess he is still trying to figure it out. At least Apple now has the same issue as us!imac 20", Mac OS X (10.6.1), AE + macbook
Thumbnails/icons are generated *and cached* by Quicklook. So, after updating Flip4Mac (for Snow Leopard you need at least beta version 126.96.36.199, newest is 188.8.131.52) you most likely have to restart your Mac. If after restart there are still no thumbnails, you can force Quicklook/Finder to rebuild its thumbnail cache:
In a Finder window enable column view and hit shiftcmdg. A dialog box ("Go to the folder:") will appear. Type: "/private/var/folders/" and hit "Go" (Enter). Finder will then go to this folder, which contains two subfolders. From here the path names are different on any Mac, so I can't tell the full path. The first folder contains a subfolder with a crazy name containing another folder named "-Caches-". In this folder, finally, you'll find Quicklook's cache: A folder named "com.apple.QuickLook.thumbnailcache". So, the full path would be:
Delete the folder "com.apple.QuickLook.thumbnailcache" and restart your Mac. You can't empty the trash before you restart, because Finder reads thumbnails from the cache you just deleted. After restart Finder will automatically rebuild the thumbnail cache (the folder you deleted in the above path), now "knowing" to generate thumbnails for files you installed a Quicklook plugin for: Flip4Mac.
Same with Perian/.avi files, with any file format and plugin.iMac 24 · 3.06, Mac OS X (10.5.8)