LED lights, SWITCHES and between :)

You're still trying to update 'clk_out' in both processes. Only update a signal in one process.

I note you've been trying clocked processes. That's the way to go - in my opinion.

Try modifying your second process to:

oneshot: process (clk_in, reset)
begin
  if reset = '0' then
    cnt <= 0;
  elsif clk_in'EVENT AND clk_in = '1' then
    if led1 ='1' then
      if cnt < width5s then
        cnt <= cnt+1;
      else 
        GRiD1 <= led1;
        GRID2 <= led1;
      end if;
    end if;
  end if;
end process oneshot;

'GRiD1' & 'GRID2' are not defined in the reset state - you need to decide how to drive then in reset. Also, you're 'reset' signal is an active low signal (resets registers when it's a 0, zero). I suggest renaming it to 'reset_l' (l for low) or 'reset_n' (n for negative), for clarity.

Cheers,

Alex