Could you please confirm whether you are using version 3.1.0.0746? You can find this information in the section shown in the image below.
I tested the application using version 3.1.0.0746, and I couldn’t replicate the issue. Are you experiencing this error consistently with other files as well? If you haven’t updated to the latest version, I recommend doing so.
Regarding this statement: “when i turn off the styles, they reappear as white boxes, and then turn on styles, they become transparent”
Did you enable the Styles for the building?
If the issue persists, could you please send us your log files?