I have a problem where some image assets do not produce thumbs. It seems Craft has an issue generating the thumbnail of large images (in pixel-values, not filesize).

Does anyone know if this is a known bug, or if it has anything to do with the server?


You're most likely running into some environmental limitation... PHP's memory_limit being the most likely scenario. Try bumping that in your php.ini file and see if that helps.

If it doesn't, check your craft/storage/runtime/logs files for any [error] or [warning] entries.

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