Hi Marc,
Indeed, I can confirm this is a new bug. I have noted it to the issue tracker.
Until then, you can fix it manually if you want to by:
– Opening up the wp-content\plugins\ajax-search-pro\backend\settings\assets\types.js file on your server
– Replacing it’s contents with this
– Saving
– Clearing the browser and site/CDN cache and reloading
The problem should be resolved.