I started a new ad-group a week ago (#9), and paused the other ones. But in this new ad-group, any keywords with a space in them (red widgets) won't display in google. But all the keywords without a space (redwidgets) will show. There are no other advertisers for these keywords, so i don't know what the problem is. This never happened in my previous ad-groups. Anyone know?
You will need to delete your old ads, I think. If you just pause them, adwords still have you listed as being on that keyword in another ad and will attempt to rotate the two ads, except one is paused so it won't appear. So your new ad will only appear half the time. That's my theory, anyway.
As far as I can tell deleting will not hurt the old ads because you retain statistics and you are able to undelete the old ad if you would like to go back to it.
Have you checked on the 2nd, 3rd and 4th (etc.) pages for your ad. Part of the problem might be that when you put the space in your keywords, you are now competing against ads which are bidding for the individual words as well.
Example: "redwidgets" competes against ad for "redwidgets" "red widgets" competes against ads for "red", "widgets" & "red widgets"
Now if someone has $5.00 as the max on "widgets" you are competing against that instead of the $.75 you were looking at for "redwidgets"