Kobayashi - 8:05 pm on Jun 20, 2007 (gmt 0)

Nakita_dog, go to the campaign summary page, click on a column link other than the one that is currently being sorted on (I clicked CTR), click on any campaign name link, click on the Campaign Summary link. Oddly, for me that solved it at that point.

If it is still sorting by the new column you changed to, that probably means it remembered your change so then try to click on your prefered column and repeat the process to see if it continues to remember it.