Ok.. i got the same problem.. now i fixed it.. but if i make workshop_2 Variables.. and change
c = a + b;

to
c = a - b;

It won´t work.. I saved the script... After 3 failed tries.. i saved the script closed it.. after loading it again.. the code is
c = a + b;
again..

it hasn´t saved it..

What´s wrong???