It stopped awarding me the stars tha ti earned. Currently I have every star for the first 4 races and only one between the last 2. Reading the stats after each race shows that i'm completing the challenges, but not being awarded the stars.
1) Pick Virus 2) Start in Canada, Greenland, New Zealand, Cuba (if not, restart) 3) Sell starting symptoms (if any), other than sneezing. If you don’t have sneezing, buy it 4) Buy 1-1-1-0 Resistances 5) Once your disease spreads to a few countries, sell sneezing to get rid of visibility 6) Wait until all countries are infected. If Madagascar closes or this is after day 30, restart 7) Pump 4 Drug Resistance and buy sneezing, coughing, vomiting 8) After a few days, unlock tier 2-3 keeping whatever symptoms it gives you 9) Buy fever, fatigue, diarrhea, pulmonary edema, hypersensitivity, hemorrhaging 10) Wait until everyone dies IT WORKS!!!!!! COPY AND PASTE IF IT WORK FOR YOU.
I used coughing because that's what i started with. Still, it works.