This has happened now with Operations Dashboard both on my PC and on a Server. Install operations dashboard, all goes well, enter our Portal URL, and we see all available dashboards. Open one, and all the widgets populate with the correct data, but the map itself never draws - just blank space. No errors or warnings.
I had a support session with ESRI about it when it happened on my PC, and we figured it was something specific to that machine that would be hard to find, so we left it there. But now that it has happened on another machine, I'm very curious to know if anyone has seen this before or has any thoughts on resolutions.