This was not the first time I had this problem, if I press press stop or pause then nothing happens. I have done about 15-20 renders before, the tg window was flickering when I press on stop the render before this. This flickering was also in the previous free tg2 version, after 30-40 testrenders I had to restart tg. Not to have the save button is rare.
Sorry, english is not my native language.