Do you happen to have a keyboard with an F-Lock key? Look for one labeled that (normally near the top left corner) -- press it if you find it, then try using the F1-F12 keys in Graal again.
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The initial state of the F Lock key is "off", and in this state, the function keys use their "enhanced" operation.
The F Lock key is a hardware switch in the keyboard. Its state cannot be controlled programmatically. Its default condition is "off". As a result, whenever the keyboard is reset, or loses power, the F Lock key will always be in an "off" state.
For some, this is not a desirable default; some people want "normal" function key operation.
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