Hi John,
Interesting, I downloaded one of your SVG file to test it on one of my dev site, and it works (at least with the standard settings, please see secure note). Would you mind doing a test for a plugin conflict? You can do this by deactivating all third-party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
And here is a quote from another user with SVG issue as well that might help.
Let us know how it goes,