I had an old Opera-offline-installer (28.0.1750.51).... It works!
So it really seems to be caused by a new version.

Same here.
I was working, closed all other Tabs except the open one.
After it I closed Opera to do a needed reboot. Then, suddenly Opera didn´t load anything and I just don´t know why.

I tryed:

• Reboots
• Reinstall
• Reinstall with Revo uninstaller (cleans also the registry and AppData, etc)
• Install Opera Beta
• Windows Restore (restorepoint from yesterday)
• Renew Runtime Files (e.g. .NET-Framework, Jawa, etc)
• did NOT find the file "operaprefs_default.ini" or any other config file
• screaming bad words

Last thing helped me, but not Opera.

System: Win 7 Pro x64

Hope there will be a solution soon, I like Opera!