All day long, I have one ad group that has no showed any impressions or clicks. Yesterday was the first day I created it and it got lots of impressions and clicks. All I did was delete some keywords from the group last night. And now tonight it's still showing zero. My other ad group is okay. Everything says active and I have no gone over my budget. I've never seen this problem before. Anyone have any idea? Is this common and I just haven't seen it before?