Currently Being ModeratedMay 8, 2012 12:03 AM (in response to mynameismyname)
Must be something weird with those jpg's. I just created a little jpg and set the finder view options of the enclosing folder to "Show Icon Preview" and that worked. I did a Get Info on the file and and looked in the Preview section (after clicking the disclosure triangle) and that also worked. I set the view options of the enclosing folder to column view and click the jpg and it shows the picture in the next column. Lastly I right clicked on the jpg and in the finder contextual selected Quick Look and that worked too.
2010 3.33GHz 6-core Mac Pro (5,1), 5870, 24GB, 27" ACD, OS X 10.6.5
Currently Being ModeratedMay 8, 2012 8:38 AM (in response to X423424X)
The only thing I changed was selecting the "Show Icon Preview" in the Finder's View Options, which was not selected before, but it was STILL SHOWING THE THUMBNAIL BEFORE.... Now it doesn't show, not under Preview in the Get Info window (not sure what you mean by "(after clicking the disclosure triangle)") neither when selecting and pressing the space key, nor when using the column view..... JPG files just don't show their previews anymore....
Currently Being ModeratedMay 8, 2012 10:30 AM (in response to mynameismyname)
I solved it:
I deleted all the qlgenerator files from the QL folder in the Library, and then kept putting back one at a time while logging out and in again..... The culprit was qlImageSize.qlgenerator which I don't even know how I got there (it's only Lion-compatible)...
...All works fine now....