When loading a project into Drone2Map for the first time, there is a significant amount of time where nothing can continue/no controls are available while the 3D map tab loads. This tab always loads the first time a project is created, regardless of whether it is needed or not. It is particularly pointless loading it at the start of a project because the only graphical info of interest before a project has been processing is the flight plan/photo positions, and these do not require a 3D tab to view.
Suggestion: do not auto-load 3D tab.