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I was trying to add keyboard shortcuts to Photoshop CS5, after watching the ctrlpaint tutorial, using function keys. I was able to map F3, F4 and F5 to Zoom Out, Zoom In and Fit to Screen just fine.

I think I closed Photoshop and opened again, and tried to assign other function keys but it now says, on trying to assign:

F3 is an invalid shortcut. The F-key cannot be used.

for any of the function keys, even if I try to assign the F3-5 again. I read on the Adobe website that F1 can't be used, which is fine, but I'm uncertain why the others won't assign anymore.

I'm running Windows 7 Ultimate 64-bit and Photoshop CS5 Extended, with a UK keyboard layout (and Microsoft Keyboard).

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up vote 1 down vote accepted

I was trying to assign the function key to Foreground Picker which is under the tools menu; if you select a standard tool and attempt to assign a function key to it, it gives a different error message:

F2 is an invalid shortcut. You can only use A-Z for tool shortcuts

which would have been more helpful than the original message which you get. That said, you can assign shortcuts with function keys to commands in the Application Menus tab like Layer > New > Layer etc.

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I'll mark this as answer when I come back to the site next, unless there are any better ones. – ataulm Mar 10 '12 at 10:56
Wow, I didn't know you could answer your own questions on this site :P – Valoric Mar 10 '12 at 11:16
it's a good feature in case you figure out the answer and others come looking for the same question in the future, but I can see how it could be abused..! I guess there's some mechanism to stop people from constantly doing it :) – ataulm Mar 11 '12 at 18:24

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