Consider it beta, but like most Opera snapshot builds, I have found it to be stable thus far. For users of the previous snapshot build, it appears a mildly annoying YouTube video bug is being addressed.
Quote:
Changelog
* Fixed problem where some IRC commands were not working
* Fixed problem where UI would not update after unsubscribing an IMAP folder
* Fixed problem where content blocker add a too general block rule when using the Details button
* Several improvements to the skin
* Embedded YouTube videos should work more often now without having to reload
* Windows: Fixed opening PDF files in Acrobat Reader plugin when the folder contains special characters
* UNIX: Made the -geometry command line argument work even when Opera was previously maximized
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