Loopback button makes sound "stutter"

Hello! I have a Steinberg UR44 connected to my computer and I am trying to record sound that is playing on my computer back into Sound Forge or Sonar; however, when I click on the Loopback button in the Steinberg interface the sound “stutters” (like a fast repeating echo). Does anybody know what I am doing wrong? Your help will be much appreciated! Thank you.

This is the setup I have:

Here’s a short video demonstration of the problema I am having:

https://www.youtube.com/watch?v=qbhVA6tfEEE

Here’s how I finally resolved the problem: I accidentally plugged the steinberg into a different USB slot, and now it works! Go figure!!