I attach a screenshot. It was only this NPC, I didn\'t see it with others and I didn\'t see it the next day on my own server.
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Have you visited the zone with that NPC before nightfall?
There is another bug report which sounds similar to this one here and seems to be related, it's at ID: 3601044 "Sprite Lighting Incorrect" by antumdeluge saying:
This is not a priority bug by any means. I just wanted to point out that sometimes when I log in during the "night" cycle some sprites do receive the shadowed effect. I have uploaded a screenshot to demonstrate this. It not only happens with character sprites. I have another screenshot that I will upload later that shows un-shaded grain sprites.
+ comment by him: Sorry, the bug report should say "...some sprites do NOT receive the shadowed effect".
I saw that effect too when I logged myself in in Semos city. It happened more than once, all NPCs where still highlighted although they shouldn't have been...
I added some code to CVS that may have fixed the issue. Please keep an eye for reappearances of the bug when using current CVS version or official client 1.10 onwards.
I'm closing this bug now. There have been no certain sightings of the bug lately. Thank you for all the people who reported this. If this appears again, please reopen the bug, or make a new bug report.