Unable to post questions through the latest version of Opera. Its quite frustrating, is this a known issue
closed as too localized by yannis, nhinkle, kiamlaluno, random Jul 10 '12 at 21:24
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The "solution"/workaround to this is to not click the tags. Instead, just type them out, being careful not to create new tags. There is something funky going on when clicking the tags. It's not a perfect solution, but at least we can post.
I was able to submit a question using Opera 10.60 on our development tier and this answer is being submitted with the same browser.
Were you logged into the site when you tried to post your question?
I had the same problem. It occurs only when posting questions (not answers or anything else) and it only occurs when using Opera 10.70 snapshot. Opera 10.61 works fine, so I guess this is just a problem in the development snapshot.
I'm using opera 10.61 and also having this problem.