You can always safely trade if you take care to make sure you are giving exactly the right amount of currency for what you want to do. the issue is about when you trade more/less than what is necessary for what you're seeking.

To be clear, the bug is "Under some circumstances, it may be possible to make a trade when the number of currency offered does not correctly correspond to the amount required for the item being traded."
So basically it's safe to trade (One hundred 99+1=100) Montiont Silverpieces to receive (one 1) Ranperre Goldpiece from Lootblox in Davoi, got it thanks for the heads up!