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Cant post Bugs on mini.bugs.opera.com with Opera Mini 7.6
I just submitted a bug report a few minutes ago, using Opera Mini 7.6 on Android, and I had the same problem as you.
After filling in all the fields, I clicked submit the first time, but nothing seemed to happen. I was simply taken to the top of the report wizard page I had completed (and, if I remember correctly, a message about not all fields being filled).
I then clicked submit the second time (and I believe I added my exact phone model after the word "Android", which had been pre-filled in the "Specify which phone and model you have").
At this point, it finally submitted correctly, and I received a page with:
"Opera Mini bug report wizard
Your bug report has been posted
If you would like to update your report with more information, please send an email to [email address]
You may wish to take a note of this address in case you need to refer to your bug report in the future