When you have lot of full-size photos, the script on the server side takes time to run.
Unfortunately the time script is allowed to run is limited, which sets upper limit to the number of thumbnails you can regenerate.
When you get over this limit, you won't be able to generate your thumbnails..
WordPress allows you to change the size of thumbnails.
This way, you can make the size of thumbnails fit the design of your website.
When you change the size to fit for theme, all future photos you going to upload will have this new size.
After changing the image sizes, you can generate all thumbnails.
If you close the page before the task is completed, you have to start all over again..
You can also select the thumbnail sizes you want to generate, so that you don't need to recreate all images if you've just changed one thumbnail-size.
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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