Hotspot size and appearance inconsistent across browsers

[basest]

I altered one of the stock hotspots (changed the color) and re-saved it with the same name. I also imported a copy of the same SVG with a new name. On Safari, everything works as expected, and the SVGs display at their natural size. On Firefox, my edited SVG does not show up at all, neither does the newly imported file, and on Chrome the edited file and the newly imported ones display at very large sizes, about 3X what I expect them to do. I switched out one of the hotspots with a completely different, unedited native-to-WebRotate SVG, and on all three browsers it looks fine. Is this a known issue? how do I get around it?

thanks for any help

 

[WebSupport]

Please see if width and height attributes are present in your custom SVGs (open them for edit in a text editor):

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="25px" height="25px" viewBox="0 0 25 25" ....>