I sent you a message with the blend file. Since I’m not sure, if you find out is a bug, I will be happy happy to file an issue on the repository.
Luckily it’s all ok.
The missing cubes were marked as symbols and, in prj, symbols have to be oriented toward the camera (object z-axis has to be parallel to camera’s z-axis) in order to be drawn. This way, for example, you can draw the swing of a door and limit his representation to plan view only. You can force the drawing of a symbol, even if not well oriented, using “Force” option (like you did with the red cube on the right).
As you can see, the square is missing because its z-axis is not parallel to the camera one.
I wish there is a way to use it with Measure it arch addon
thanks for your suggestion.
At the moment prj’s development is focused on other functionalities.
Maybe in the future I’ll consider an integration with MeasureIt_ARCH
Marzof, sorry for my late response. Yes PRJ addon works with imperial units.