Same here. My problem was on Seamonkey 2.9 but not Firefox 3.6.28 or Opera or Palemoon 11. Right column of three blank and could not be corrected. Solution: Mine was caused by the AdblockPlus filters. Hover over Adblock icon in toolbar and rt click, open blockable items and delete the first filter at the top, then reload. I had to delete the top two filters and reload to get the column back. Now its ok but it had something to do with the iGoogle page update process versus Adblock. Never had a problem before. Always check out Adblock first when these problems arise.