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Google hates Opera 
. Identifying or masking as Firefox in site preferences solves the problem, but for some reason it breaks keyboard shortcuts in Google Reader, and there are probably other things that it breaks that I didn't notice/didn't affect me.
So you can change it if you want (you could do it for just eg plus.google.com rather than google.com in general to reduce the potential issues if you wanted) but keep it in mind in case you suddenly encounter strange behaviour on Google sites.
. Identifying or masking as Firefox in site preferences solves the problem, but for some reason it breaks keyboard shortcuts in Google Reader, and there are probably other things that it breaks that I didn't notice/didn't affect me.So you can change it if you want (you could do it for just eg plus.google.com rather than google.com in general to reduce the potential issues if you wanted) but keep it in mind in case you suddenly encounter strange behaviour on Google sites.