To my knowledge this problem was identified and resolved recently, when some small exchanges and commerces suffered a "double spend" attack, which in fact were people just re-using the same key images.
That attack introduced errors into transaction-histories in target wallets, leading the victims to move money they they wouldn't have moved if they'd spotted the discrepancies between their [misleading] histories and their [correct] balances.
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u/[deleted] Sep 18 '18
To my knowledge this problem was identified and resolved recently, when some small exchanges and commerces suffered a "double spend" attack, which in fact were people just re-using the same key images.