It seems that I've figured out how to fix that, you simply have to correct the conversation order in conversation.txt file located in ACOK module folder. Apparenly the "king Renly is dead" line (with number 820 in it) refers you to "Renly..._What has Renly ever done to earn a throne?" line under the same number, not allowing you to finish the quest. I've introduced the correct order by changing 820 to 835 and 821 to 836 in the relevant lines, here's a link to this code fragment Pastebin.com.
Sovunovich
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