fuzzy, I don't use that program, but I do use Edge. I noticed that when MS shoved the anniversary version of Win10 down my throat that it turned Cortana on in Edge. I turned it back off through Advanced/Settings. Just theorizing that the same thing happened to you and it may be the culprit in your Ameritrade app. Just guessing...
Hey Fuzzy..similar thing happened using Firefox and Trade Architect...TA opens fine for me using Chrome---so, since I use ThinkorSwim 99.999% of the time, I just open Chrome when I want to run Trade Architect----certainly not a fix, but a workaround..