m.facebook.com cannot login with opera!

[jusetan]

1. open my email.
2. click the facebook link to view a message from a friend.
3. opera opens, showing the m.facebook.com login page.
4. type in my user name/pwd, click okay.
5. it reloads the login page.
6. reattempt.
7. reloads the login page.

only way I can get it to work is if i login to the FULL SITE, then keep that window open, and go back to my email and click the link - then it opens a new tab that is logged into facebook mobile.

I am running the latest version of mightyrom4. Had similar issuse with r3born version too.