If you're having an issue with your Paypal checkout procedure, please try making the following changes to your account profile:
1. Log into your PayPal account at https://www.paypal.com
2. Click the Profile link
3. Click the 'Language Encoding' link under the Selling Preferences column
4. Click the grey 'More Options' button
5. Choose "UTF-8" from the Encoding drop down menu
6. Select "Yes"' for "Do you want to use the same encoding for data sent from
PayPal to you (e.g., IPN, downloadable logs, emails)?"
7. Click "Save"
Now the problem should be solved - give it a go.