>>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?
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>While I basically agree with your analysis, I don't think currency values have an exponent. I understand they are stored as an integer. The value stored as an integer would be the value the user sees, multiplied with 10,000.

You're probably right. When it comes to maths, I'll gladly follow your lead ;) Anyway, it seems to be a high-bit corruption.