Power BI is stalling at the "Initializing model" step when first opening the application, and this is preventing me from opening or using the program. (This is after a fresh restart on my computer.)
Note: several others have reported the same issue this week on this closed thread: http://community.powerbi.com/t5/Desktop/Power-BI-Stalling-on-Initilizing-model/td-p/17542
The prior thread seems to have the same symptom but a different cause.