I'm not so sure I am understanding, but this is the scenario:
In the new installation I am using joomla 2.5.11 with CBSubs 3.0
In the other installation I use joomla 1.5 with CBSubs 1.3.
In the old installation we use a off-line payment gateway configured with the main currency as USD and the multicurrency option in Global setup in off. So all the plans are charged in USD.
People that select that option is charged with the price in USD in the basket, even people that selects the offline gateway. But when the administratos selects tha pay now button in the basket for the offline payments, the system lets him select the currency (mexican pesos and others). So we can change the amount to Mexican pesos each time. In fact, we change the currency to all the offline payments.
But in the new installation, we tried with multi currency in off mode or in Mexican Pesos, and the basket payment option doesn't permit us to change the currency from the original USD to mexican pesos, as occurs in the old installation.
Does it mean that CBSubs changed this feature from 1.3 to 3.0?
Regards