It looks like ionic may have changed the svg loaders to use absolute positioning (in pixel units) which does not seem to like the css width/height attributes.
// http://ionicframework.com/docs/theming/
// App Global Sass
// --------------------------------------------------
// Put style rules here that you want to apply globally. These
// styles are for the entire app and not just one component.
// Additionally, this file can be also used as an entry point
// to import other Sass files to be included in the output CSS.
//
// Shared Sass variables, which can be used to adjust Ionic's
// default Sass variables, belong in "theme/variables.scss".
//
// To declare rules for a specific mode, create a child rule
// for the .md, .ios, or .wp mode classes. The mode class is
// automatically applied to the <body> element in the app.
ion-spinner {
width: 40px !important;
height: 40px !important;
}