Recently I had 3 fatal errors (fatal error message popu-p, then CTD) when I was trading with station - there you can either use toggle bar to define the qantity you buy/sell, or you can hove mouse over number and then type it in.

When I typed the number I had some faal errors, but I don't know which combination triggers the error. Bfore I was using this typing methot wihout problems.