Sound output choices don't always stay fixed

On my mac pro, when I select headphones as my output for sound in my preferences, some things do not respect this and instead play sound through my external speakers, most noticeably in flash player videos. In fact, playing some videos in a flash player (through a browser), will actually make the computer's general sounds start coming from the speakers as well, even though my preference is still set to output:headphones.
Anyone else hit this bug, and did you find a workaround?

I find that changing the sound output device needs to be done twice, almost every time.
For example, when changing from Internal Speakers to Line Out, I either need to click Digital Out then Line Out, or click Line Out then Internal Speakers then Line Out again.
So, as long as I change the output device twice it works. If I only switch from the current output device to the one I'd like to switch to, it doesn't work.
While this is all very annoying, I have found a few things that make the process a bit easier:
Instead of clicking System Preferences > Sound > Output to get to the output device selection screen, you can hold down Option (⌥) and then press any of the Sound keys (Mute, Volume Up or Volume Down).
Another option is SoundSource by Rogue Amoeba which lets you switch all sound devices with a single click on the menu bar.
I hope that helps.

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