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Hello, welcome to the Opera Forums.
It would be helpful to provide the full address to the site/page in question so that responders don't have to guess and can just click on a link.
I went to igoogle.com which redirected to http://www.google.com/ig. When I click on Sign in, it goes to https://www.google.com/accounts/ServiceLogin?continue=http://www.google.com/ig&followup=http://www.google.com/ig&service=ig&passive=true&cd=US&hl=en&nui=1<mpl=default
On secure https pages, to the right of the address should be box with a locked icon and domain name. If you click in that box or press Alt + Enter, a Security Information window will open. At the lower left corner of the Security tab, it will tell you the security protocol being used. For Google accounts it is:
Encryption protocol
TLS v1.0 128 bit ARC4 (1024 bit RSA/SHA)
Go to Preferences > Advanced > Security > Security Protocols. Enable TLS 1 needs to be checked and in Details >> 128 bit ARC4 (RSA/SHA) needs to be checked. The default settings are to have all of the security protocols enabled, and in Details, the first five 0 bit and Anonym are not selected and all others are. Click here for an image.
It would be helpful to provide the full address to the site/page in question so that responders don't have to guess and can just click on a link.
I went to igoogle.com which redirected to http://www.google.com/ig. When I click on Sign in, it goes to https://www.google.com/accounts/ServiceLogin?continue=http://www.google.com/ig&followup=http://www.google.com/ig&service=ig&passive=true&cd=US&hl=en&nui=1<mpl=default
On secure https pages, to the right of the address should be box with a locked icon and domain name. If you click in that box or press Alt + Enter, a Security Information window will open. At the lower left corner of the Security tab, it will tell you the security protocol being used. For Google accounts it is:
Encryption protocol
TLS v1.0 128 bit ARC4 (1024 bit RSA/SHA)
Go to Preferences > Advanced > Security > Security Protocols. Enable TLS 1 needs to be checked and in Details >> 128 bit ARC4 (RSA/SHA) needs to be checked. The default settings are to have all of the security protocols enabled, and in Details, the first five 0 bit and Anonym are not selected and all others are. Click here for an image.
Firefox 23.0, Opera 10.11-4791; Platform: SunOS (OpenIndiana); System: i86pc Opera Desktop Team Security @ Opera Sitepatching blog
Linux in VirtualBox | Opera 12.15-1748
Linux in VirtualBox | Opera 12.15-1748
That fixed it for me too. I do not know how so many of the protocols got unchecked in there for me. 
But it works now, so I can stop switching back and forth between Firefox and Opera. Thanks for posting.
But it works now, so I can stop switching back and forth between Firefox and Opera. Thanks for posting.I was having the same problems as above (Opera 10.53 on OS X 10.6.3)-- could not sign in to any secure Google sites, had to use Chrome instead, which always worked fine.
In my case, deleting cookies and caches did not work.
I didn't bother with the reinstall because the security protocol description seemed a little more targeted of a fix.
I checked in my preferences and TLS 1 was already enabled as was the ARC4 128 bit protocol mentioned above.
However, TLS 1.1 was not checked, and this seemed to do the trick for me. I've tried checking and unchecking it to test the behavior. The problem comes back when it's not checked, and goes away when it is.
I know NOTHING about security protocols, but is it possible that Google switched to TLS 1.1 recently? Either way, hopefully this will help someone else struggling with the same setup.
In my case, deleting cookies and caches did not work.
I didn't bother with the reinstall because the security protocol description seemed a little more targeted of a fix.
I checked in my preferences and TLS 1 was already enabled as was the ARC4 128 bit protocol mentioned above.
However, TLS 1.1 was not checked, and this seemed to do the trick for me. I've tried checking and unchecking it to test the behavior. The problem comes back when it's not checked, and goes away when it is.
I know NOTHING about security protocols, but is it possible that Google switched to TLS 1.1 recently? Either way, hopefully this will help someone else struggling with the same setup.
Google has not changed their protocol. All sites need to upgrade to TLS 1.2; the previous protocols have a security vulnerability. Enabling the all of the protocols and all but the 0 bit and Anonymous ciphers solves problems with logging in to secure sites.
Firefox 23.0, Opera 10.11-4791; Platform: SunOS (OpenIndiana); System: i86pc Opera Desktop Team Security @ Opera Sitepatching blog
Linux in VirtualBox | Opera 12.15-1748
Linux in VirtualBox | Opera 12.15-1748