This happened once a while back when LJ was switching servers. The user icons got all jumbled up or didn't appear at all.
Also, if it was in a community, then it could be the settings. A community can be set to use only its own icons in posts. (I'm not sure, but I think you can do the same for you own friends page, too.)
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Also, if it was in a community, then it could be the settings. A community can be set to use only its own icons in posts. (I'm not sure, but I think you can do the same for you own friends page, too.)
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this issue was going around my f-list a few weeks ago, apparently it's an LJ glitch.