On Ivo's answer to this question the "flag" post link is missing.
I've checked other posts at random and they all seem to be OK. This has been consistently missing too.
I should have added I'm running Google Chrome (5.0.375.99) on Windows-XP.
Okay, I figured it out.
You can't flag a post that you have accepted as an answer. For example, I am missing the link on What are the major differences between the different versions of the PS3?, which is an answer I accepted. The same occurs on the Trilogy as well, so it's always been a feature that I guess we overlook.