Function keys since upgrading to Yosemite Option + F1 takes me to Display preferences, instead of using the current app binding, as it did in Mavericks. Is there any way to override this behavior?

I can't find the binding in Preferences -> Keyboard -> Shortcuts.

I see the binding on the Apple shortcut page, and I think it's always been there, but previously applications could overrule the setting.

If it's relevant, the app in question is IntelliJ Idea.
It turns out the problem came from the external keyboard, a Logitech K750. I had to use the Logitech Control Center to get the correct behavior. Why this wasn't a problem in Mavericks, I'm not sure.