Hi,
I am sorry but I have not been very clear in my advice.
I tried to explain that you might want to clear the cache of the app (go to apps, select iGo and clear the cache)
As for the data: the app stores data on your unit. That data has become corrupted on occasions on my NavAll 1. After I removed the data (and lost my history of places and such) the app would work again. I had to use a file browser to remove the data on the device. You might want to try going to apps - iGo - clear/remove data.
The card probably only holds the maps. If that is the case you don't have to change / remove anything on the card.
Edit: I should read more closely: yes although the card is new, corrupted data or cache could still cause the problem.
HTH