Test data import error

Hello there,
Since yesterday I have been trying to import testing data using wptest xml file. It keeps giving mee error messages of ” failed to upload some media”. I tried the test-data from www.ads-software.com. Now it just work on importing and them stops giving me blank page with no failed or succeeded messages. I went to the database and found that it’s populated with new Posts, Users and other testing data. Still the wp-admin and the front end don’t show any new info.