I have faced this several times that if I stop a calculation during the first iteration, it would not stop and the stop option would also be disabled! then,I have either to wait until all calculations end, or force the program to exit(end-task), which I do not like to do so.
Is there a solution stop if the 'stop' button has disabled?
In the figure below, I have set 1000 iterations, after clicking the 'calculate', I remembered something else to change and I pushed the 'stop'. It continues calculating and the stop is also disabled.