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I just got a new theme and am trying to regenerate thumbnails. I'm having trouble though. I tried using the AJAX Thumbnail Rebuilder but for 5 hours it just said reading attachments. Then I tried the normal rebuilder but the vast majority of images came back as undefined.

Any ideas?

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  • Have you enabled post-thumbnails in your functions.php file?
    – Dan Gayle
    Commented Jun 1, 2011 at 17:15
  • yes I have, I have thumbnails showing up on the site, just not correctly (dev.wegotthiscovered.com)
    – Matt
    Commented Jun 1, 2011 at 21:00
  • even for the ones that it said it re-sized, it did't, not one image worked
    – Matt
    Commented Jun 1, 2011 at 21:45

3 Answers 3

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i have only had to do this on a couple of occasions, but each time i have used this regenerate thumbnails plugin on each occasion with a 100% success rate, however (as you will expect it did take quite a bit of time as i had over a 1000 images that it had to wade its way through on each occasion.

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  • I did this and out of 6000 images, about 3500 came back as undefined, any idea why?
    – Matt
    Commented Jun 1, 2011 at 20:59
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    did you try this: jdhodges.com/2011/05/…
    – MartinJJ
    Commented Jun 1, 2011 at 21:12
  • No but all my images are in the same folder, so if it can access some with the 755 permissions, shouldn't it be able to access all?
    – Matt
    Commented Jun 1, 2011 at 21:14
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I find the AJAX Thumbnail Rebuild to be better than the regenerate thumbnails plugin, because it doesn't tie up your server as bad, allows you to skip certain sizes (which saves time), and gives more visual feedback.

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  • I tried it with only doing one size and still, for hours and hours it just showed me that message "reading attachments"
    – Matt
    Commented Jun 1, 2011 at 20:59
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@Matt

From my personnal experience, and about half a million other people, Force Regenerate Thumbnails is the best thumbnails regenerator I have ever used.
Hope this will help you.

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