Can't Send Function Keys with MBP Keyboard

I'm using VMware Fusion Professional Version 6.0.3 (1747349) on a Macbook Pro 15 with Mavericks 10.9.2 as the host OS and Windows 8.1 Pro Update as the guest OS.

I'd like to send function keys (F1, F2, etc.) with the laptop's built-in keyboard, but the only way I can do so is through the VMware menu: Virtual Machine > Send Key > F11, and so forth.

I tried the suggested method, <fn>+<Function Key>, but that does not work. I also tried changing the OS X keyboard settings to "Use all F1, F2, etc. keys as standard function keys.", but that, too, fails.

Is this a bug, or am I missing something? Thanks.

-David