Go to Opera settings menu (button on the top left), select Settings and then Preferences.

• Select the Advanced Tab
  
  Java Script should be allowed
  • Select Content from the left menu
    • “Enable JavaScript” should be selected
   
  Accepting Cookies should be enabled
  • Select Cookies from the left menu
    • “Accept cookies only from the site I visit” should be selected
  SSL 3.0 security protocols should be used
  • Select Security from the left menu
    • Press the “Security protocols” button
      • “Enable SSL3” should be selected
      • Press OK button to close the security protocols window
    • Press OK button to close the preferences window
       
      

Delete Cookies and Files

Go to Opera settings menu (button on the top left), select Settings and then “Delete Private Data”

• Delete temporary cookies should be selected
• Delete all Cookies should be selected
• Delete Entire cache should be selected
• Press the Delete button

To apply the new settings, close and reopen your browser.