Can someone please help me...

I am having trouble uploading my data sheets. I have tried everything! To Start I know its not my data. I am uploading a copy of Complete Catalog from Easy Populate with all but 1 record stripped out.

When I upload it it spins for about 3 minutes and returns like its trying to hit my back end again but the page looks like the front end (And its blank with my sites template)

DOMAIN/admin/easypopulate.php?split=0

If I refresh or click on the URL and hit enter it goes back to easy populate but nothing is updated.

I am running:

Zen Cart 1.3.8a
Database Patch Level: 1.3.8