Simulator 4.1 activity playback, anyone get it working?

First off, I really like the updates in the 4.1 simulator.  The profiler will really help with code optimizations. 

I am having problems however when I try to play back a recorded fit file.  I assume I am doing something wrong, but can't figure out what.  I start off with opening the activity data window from Simulation > Activity data.  It took me about 5 times to learn I have to leave the window open for the simulator to keep using the activity simulation.  In the next window I select simulation for the data source, then click on the play arrow and it will start the timer, the arrow will switch to a Pause icon, and I can see the info show up in the device app.  If I select file for the data source, then click load file and pick my fit.  I see the play arrow activate, but nothing happens when I click on it.  It stays as an arrow and the timer does not start.

I have tried multiple different FIT files I have to see if it was something with the file.  I even deleted the SDK and re-downloaded it.  The menu seems pretty straight forward, but I can't figure this one out.  If you have got this to work in the 4.1 simulator, I would appreciate some hints.  Blush