The same exactly page appeared to me , I think three times happened , when I tried to play a casino game the one tme , the other two times to place a sport bet through the pokerstars application , INSPITE OF THE FACT that before this , the previous days , all (casino , sports betting )were factioning just fine .
At first I was panicked , I went to the page internet page to get CEF , OMG , I didn't understannd anyhing if all these , I had to install a programm , then write/copy many programming info from the site , very confusing things cause I had no idea of programms and programming .
Thanks God , when I restarted my pc next day it was just fine by itself , the other times I did the same , retsart of the pc and the problem was fixed by itself , don't know how .
Try waiting for one day as I did , or restarting your pokerstars application , or restarting the pc again and again (better terminate the pc and start over from the beginning to be sure ) ,but you have already done all these things , do them again and again , wait for a day or two if it's pokerstars problem , , or if these don't have an effect reinstall the pokerstars application , that I didn't have to do , but if you cannot save the notes and you don't want to reinstall Pokerstars , send email to stars .