failed to use debugger

[userrand]

I tried following the steps to get the debugger to work but the debugger does not seem to do anything after clicking on start debugging.

I used this example given in another issue here that I found:

fib[2]=1;

fib[3]=2;

fib[4]=3;

fib[5]=5;

fib[x_]:=fib[x]=fib[x-1]+fib[x-2];

fib[30]