This is an old thread, but I found it and want to say that I tried the new Opera versions since 12.17 and don't like them half as much as Opera 12.17. Yet then I just read that 12.14 is more compatible with websites, so I just replaced 12.17 with 12.14.
I already have IE11 and Firefox, and even with Opera 12.17 it was easy to click on a webpage and choose on the popup Opera gave "Open with" and choose Firefox or IE11, whenever a page would not work wel with Opera 12.17.
Let's see if Opera 12.14 has less issues with web pages, although 12.17 usually worked fine, but not always.
For security, by default I surf in the virtual space -sandbox- of Sandboxie, so I never get bugged.