Откройте - http://www.youtube.com/html5 и убедитесь, что Вы не участник бета-тестирования html5 версии YouTube.

В адресной строке ввести - opera:config#UserPrefs|ShowDropdownButtonInAddressfield поставить галочку и сохранить в конце блока.

Changelog

Cross-platform
Mouse gesture sensitivity/recognition fixes
Several crash fixes (Dragonfly reload, file download, extension autoupdate, search suggestions, mail account dropdown, and more)

Core
Several crash fixes
CORE-1377 Support DOM3 window.DOMStringList
CORE-6716 Script element re-executed if child text changes
CORE-8390 HTMLElement.toString() throwing an exception for all HTMLElement prototypes
CORE-32425 Crash when clicking a link twice
CORE-34292 Touch event attributes misnamed in SVG
CORE-30292 Cross-network warning misfires
CORE-33886 opera:config cannot do cross-domain xmlhttprequest after reloading
CORE-28407 Small amount of alphanumeric characters breaks the heuristic language detection
CORE-17830 href property for import returns resolved URL instead of original string
CORE-16738 Dynamically added stylesheet fails to apply if rel attribute is set after href attribute
CORE-23627 Add name and align as HTMLEmbedElement members
CORE-27624 Pressing Enter in <input type="number"> doesn't submit form
CORE-33113 Default margin on body is 5px when the document is in an iframe, should be 8px
CORE-28251 Fragment identifier matching needs to allow ID to override NAME
CORE-20367 textContent creates multiple text nodes from big (>32000 characters) string
CORE-18529 DocumentType not prototypable
CORE-34298 Empty script elements still have an empty text node child
CORE-33964 Feed preview fix
CORE-28782 Windowed plugin not shown if displayed inside positioned iframe with overflow container

Winstaller
DSK-322193 Crash when installing or uninstalling Opera
DSK-316074 No File Lock window on upgrade when Opera is running on Windows 2000
DSK-306014 Several processes when upgrading on limited Windows Vista/7 account
DSK-320566 Problems after MSI update that requires reboot
DSK-321901 Opera creates a file called desktop.ini and places it on the desktop
DSK-322333 Switching languages in the winstaller does not change the language in the help tooltip
DSK-323419 Error code 76 if the MSI uninstallation fails to find the source package

Mac
DSK-288233 Streaming Silverlight will not display (NRK nett-TV)
DSK-320146 Scroll bar not shown properly in M2
DSK-322782 Window switching keyboard shortcut not working (Command-`)
DSK-208657 Enable Mac OS' File Quarantine