I received the same blank screen error and worked around it.
Click on "forms" in the top. Then click command-F to search, and enter 1099-B. You should see 1099-B worksheet. (You might need to have an existing 1099-B for this to work.) Don't click on open. Instead double click on the 1099-B line. Oddly, this brings up a menu to make a new form (via a copy, but it copies only the blank form). Then select the second option "Enter Name of Broker" - for example, "Morgan Stanley Corp." The click open. This will give you a new sheet where you can fill in the broker name and the first transaction. Then you can switch back to EasyStep (top menu) and instead of trying to add a new 1099-B and getting the blank screen, you can edit the existing one that you added through the forms.
