I was also wondering if it was common to see bid changes in the lift for conditions in an A/B Test over the lifetime of the test. I'm not aware of any circumstances outside of the test that would cause this shift. For example, we avoid using auto-allocate because in the past the test that was leadin...

What is the easiest way to add an image to an A/B test? Also, when we have added images, the pages loads with the original image and then loads the test image. That is, the page flickers. Is there a way to handle this issue?