My browser / operating system: Windows NT 10.0, Chrome 52.12743.116, Flash 28.0 (release 0)
I had written the simple code

if key a pressed
then
move -10 steps

when the key is pressed, nothing happens even when only that key is pressed. My keyboard is new as well and isn't faulty.

However, when I had another block of code with the space key being sensed it works fine.

Could someone please tell me what's happening and how to fix it.

I have that problem to

Can you please share the project in which this is happening?

You probably need to put a forever block around it.

For instance,

when green flag clicked
forever
if <key [a v] pressed?> then
move (-10) steps
end
end

doesn't work

I went back onto scratch and the problem magicly resolved itself, so thanks everyone who replied