Another one to remember when troubleshooting SharePoint pages. Allows you to get to the webparts on the page in a manner to see if one is crapping out the rest of the past. appending the ?contents=1 to your page url will open the

“Web Part Page Maintenance: default 
  Use this page to close Web Parts on your page, restore defaults to Web Parts, or delete Web Parts from your page. The following Web Parts are on your page. To modify the page, select one or more Web Parts and then select an action “