Opera is fastest Browser & most favorite of mine ... very few times it trouble me compare to "Google Crash" & "IE crap".
Recently I faced such problem with opera I couldn't login to quora by any Method ... it simply doesn't login to Quora don't know if it's Site Problem or Opera .. I hope Opera guys look in to it.
I use Windows 8 - 64 bit OS with Opera Latest Updated 32.. version.