MLV Auto Currency Switcher

I installed the app and the process was pretty easy and self explanatory. However, the app was crap due to the following, your default currency isn't saved, the price keep changing when you switch between multiple currencies. Looks like there is a bug, that suddenly it doesn't convert rather than just changing the currency sign. I was in a trouble when one of the customer chatted with me about the prices are unbelievable then I noticed it doesn't do proper conversion.