Upload not working!

Hi there, thank you so much for this plugin! It has worked for me for the last month or so. Today, unfortunately, it stopped working. I was uploading SVGs just fine. WordPress installed an update. Shortly thereafter, I get the usual message when trying to upload: “xxxxx.svg” has failed to upload.
Sorry, this file type is not permitted for security reasons.”

I reverted back to the last WordPress version, and that didn’t work. Then I reverted back to the last 4.6.2 which was the last known compatible version. That also didn’t work. Do you know what could be causing this?

Thank you in advance for you help!

Jules