So, I'm working away today on my iMac OS X 10.6.4 mainly just screwing off visiting social networking sites on the web. Later, I minimize my windows, and notice the icons on my desktop are a little strange. Upon further research, all the folder icons are gone (or they are transparent). You can see the folder name, but no icon associated with the folder. Also, all my pdf, jpg, png, etc are now associated with Adobe (either Acrobat or Photoshop CS). They used to be associated with the Application "Preview". I've rebooted and tried a lot of other things to restore icons, and nothing has worked. Here is what I have found. I dont think it's an icon problem, I think it's a "Preview" problem. If I click on the "Preview" icon nothing happens. If I right click on a jpg (for instance), and select "Open With" - Preview is not there. If I Choose "Open With Other..." within the Application folder, "Preview" is grayed out. If I select "Enable All Applications" then "Preview" is no longer grayed out. But when I select it, and select "Open", nothing happens. Everything "appears" to be working normally. Just I no longer have any folder icons on the desktop or within finder. And I am no longer able to open anything within "Preview" All my files are now associated with another application (which works fine) but not with preview. I finally found a way to copy a folder icon to the "invisible folder". If, for example, I right click on my "DropBox" folder (which I can see) and select Get Info, I can copy that icon to a "Normal/Default" folder such as Documents. So I did that to about a dozen folder and it worked. But there is no way I'm going to do that to 1000 folders! Today, Aug 27, I get a security update and a few other things from Apple and I install them. Then I'm asked to reboot. After I install the updates, and reboot my iMac, even the folder I cut n pasted are now gone. And so are the jpg gif and pdf icons are now gone too. Prior to the update, the pdf, jpg and gif files had a Photoshop CS icon (instead of the previous "Preview" icon and preview that I'm trying to restore.). Now even the Photoshop and Adobe icons are gone. This is getting crazy! Any help? Anyone? Wish I could attach an image here then you could see exactly what I'm talking about. I've spend a couple hours now trying to figure it out. Still no solution. Help? Anyone? Funny thing, I just uploaded screen shot of my problem. But, when I use the Manage Attachements Window here to select the file I want to upload, I can see ALL THE CORRECT Icons PERFECTLY! hahaha But, when viewing on my desktop on within Finder, the icons are gone. I'll try to do another screen shot and you'll see.