It does make sense.
Admin CP | Settings | Options | Post Thank You Hack
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Quote:
Ban Usergroups
Any UsergroupID placed here will ban any user from that group from using this hack. They will still see if others clicked 'Thanks' but not see the button.
Enter a list of usergroupID numbers, separated by a | (for example: 1|2|3).
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I'll try this. If it works, it would confirm my suspicion that it is triggered by bots trying to do a search for Thanks given by and/or received by a user (I assume a bot because I can't find a way for a human being to do that with this 4.x version).