that little icon is telling you that the change has not yet taken place...you just have to wait. I have found that sometimes those kinds of changes can happen in 10-20 minutes, but often they will take much longer - I had it take a whole day for the change to be in effect.
When the "clock" icon goes away, you should be sorted. BTW, when checking for the presence of the "clock" icon - make sure you are not doing that by "refreshing the page", and allowing a "repost" to occur - if you do that, you are just sumbitting continuous changes (even if you did actually "change" anything), and you'll be waiting, and waiting, and waiting...
Check the icon by just clicking the "Manage Domains" link.