I would like to support bover21`s report. I am facing the same issue - fresh install, no extensions, Win10. When I receive a new whatsapp message, my Opera browser (45.0.2552.812 (PGO)) just freeze, only solution is to kill the process via task manager.

panosdk: THANK YOU!!!!! I had same problem under Win10, every page - webpage or some internal page (bookmarks, extensions, etc.) crashed everytime after 2-3 seconds (clean Opera install with no previous profile). I uninstalled google desktop and since then everything is running OK.