win 7

I am using Opera 12.16 and wanted to update to Opera 17.
After installation I could start Opera 17, with a grey skin of the background, and
it is working fine.
Starting Opera with a link out of my email client, Outlook, Opera 17 starts with a
blue skin and is not connecting and therefore not working.

Result, uninstalling Opera 17 and making 12 again the default browser.

Is there a reason and a solution for this?

lg Bogus