I offered a bounty on another person's question on Web Apps yesterday, but did not receive the Investor badge.
When I awarded the bounty today, I did receive the Altruist badge. I still have not received the Investor badge.
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The user who asked that question, "user8144," appears to be deleted. You may never receive the Investor badge for that particular bounty.
A similar issue was reported at Did not receive investor badge, does the bounty need to expire/be awarded?. Colin never did get his Investor badge.