A: Scaling for Vector graphics display can be problematic. As a workaround, starting with v1.56, converting from Bitmap to Vector will preserve the size of the display, which is good because Bitmap scaling is pretty reliable. Bitmap generation is also much faster than Vector. I thus suggest first generating a display as Bitmap, and when it's been finalized, do one last conversion from Bitmap to Vector.
While you should not need it anymore, note that there is also a manual rescaling factor in "Main Settings" so that you can tune the size once and for all for your machine, when generating a Vector display form scratch. One way to use it is to create a Bitmap display and a Vector display with the same content, and find the correct ratio to apply to the Vector one to match the Bitmap one. You can also try comparing with normal text in a PowerPoint Text Box, making sure to use the same font (e.g., Times New Roman, or ideally Computer Modern if you have it loaded in PowerPoint).Q: The aspect ratio of vector graphics displays is changed when regenerating after moving a part of the display outside the original bounding box.