I tested the workaround and it seems to work. What you do is when you get to the screen where there are 3 choices, the first is the stock/mutual fund sale and if you chose that you get a blank screen - choose the third "Other" and then it asks for a name - enter your brokerage, then the next screen there is a drop down menu. Choose stock (non-employee), Mutual fund or ETF and proceed to enter the info. It seems to work. It is more challenging because "other" includes all sorts of other stuff like RSU, options, etc.... But at least it is a way to proceed and bypass the blank screen issue.
Also as reported in this thread earlier, someone did contact Turbotax and replicated the issue. Support was not able to solve it.
