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>BTW, we also saw currency fields unexpectedly changing. But those fields changed by trillions. It was asy to spot those errors. :)
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It's probably the same thing: since currency are stored as fp numbers, a change in the seventh bit will most likely cause a radical value change (in the exponent, for instance). You could try to check this out with the hexedit tool - and compare values before and after your correction. So, at random places in your database files, bytes are being ored with 10000000. A virus attack? RAM or network problems?