AutoHotkey's hotkeys do not work in Skyrim

Certain inventory operations are ridiculously tedious in Skyrim. I wrote myself a script that would sell my items one by one, because according to internet wisdom, you do not get Speech experience for every sold item if you sell them as stack.

The script looks like this (works only with the skyUI plugin):

toggle=0

F7::
If (toggle := !toggle)
{
  SetTimer, Timer, -1
}
return

timer:
while toggle
{
  Send {e down}
  Sleep, 50
  Send {e up}
  if (!toggle) {
    break
  }
  Sleep, 100
  if (!toggle) {
    break
  }
  Send {HOME down}
  Sleep, 50
  Send {HOME up}
  Sleep, 100
}
return

It works perfectly if I assign F12 as hotkey, but I am using that one for a script that just spams E. So what's wrong, why is F12 the only hotkey that seems to work in Skyrim?