As title, I already post this question in stackoverflow.com
This could be an image (?). Does other content with images show correctly?
Did you migrate a site?
Have you copied stuff between mountpoints?
Have you read http://docs.plone.org/manage/troubleshooting/transactions.html#blobs-and-poskeyerrors ?
Oh, I see in your stack overflow question that you'd answered it. Good job 
Thanks a lot. espen and T. Kim,
I solve this problem.
and answered in stackoverflow
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If that post isn't already in our docs it needs to be!
Great !!
@eleddy (the author of that plonechix blog post) is really quite something and worth going out of your way to meet if you ever get the chance She lives like she codes! (or is it the other way around?) i.e. to the hilt
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