When uploading your Accounts excel file you must use the 2 letter ISO country code for the country field.
These are the codes: http://en.wikipedia.org/wiki/ISO_3166-1
If you did not use the 2 letter code then it may appear to you that the upload was successful, however when you look at the list of Accounts you'll see that Pepperi did not load a single Account.
In order to check if this is the problem - go to the Error Log Screen and download the log for the file you just mapped.
How to access the Error Log Screen: Access the Admin Error Log
The last column of the error file you downloaded will contain the error that caused each line to fail.
The Error will say: ERROR: Field: Prop_Country exceeds the maximum length of 2 characters.
Replace the country values in your Accounts file with the official 2 letter ISO country code and re-map and upload the file.
In this example the Country column values should be US.