Hotspot questions are not fully exported. The marker is not exported. And the sizes and positions of any right or wrong answer areas are not exported. If you are converting to Perception, you'll need to re-work these questions from what is converted. The layout in Question Mark for Windows is not fully carried across to QML, which defines only the content of the question, and not the way it is laid out.
All font information is lost.
Borders on components are lost. Graphics inside rich text are not converted. And not all rich text formatting is exported. Multimedia calls and buttons are not converted. Supplementary questions are not converted.