I used the "Bulk Update Pricing" feature within ML9.
To my horror when I clicked to update all the prices, they were all rounded to the nearest whole number! - All 3,000 products!
I contacted support and they said this is a known issue, and sent me a fix (an update to the update price stored procedure)
Would have thought this is a highly dangerous bug in ML 9, and would need urgently fixing for everyone.
Luckily, I had a very recent backup of the DB, so could roll back the prices, but others might not be so fortunate.