I just stumbled across an old question of mine, realising it didn't yet have any accepted answer. However, when I viewed the page, I noticed that the tick marks for accepting answers had all disappeared. Is this by design - if not, what's up here?
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Did you previously set up a bounty on that question? Questions that have a bounty expire without an accepted answer can never have an accepted answer. In your reputation history you have a -50 for that question, which almost always suggests a bounty was offered.
The existing accepted answer to this question — this MSO question, not the SO question that it's asking about — is wrong, although it was correct at the time that it was written.
On June 18, 2010, the bounty system changed. Bounties and accepted answers are now completely independent creatures. A happy side effect of the change is that it is now possible to accept old answers such as these.
This answer is just for future reference; you can clearly see that the OP already went back and awarded that richly deserved green checkmark.