@Tahmmee, @yosikal I was able to solve this problem by recompiling the CSS. When you upgrade Ionic it will upgrade the node_modules/ as well (that was my case), there’s this package called gulp-sass which is really important because it generates the minified CSS (from your SASS) that the Ionic app uses. In my case, the problem was that the version of gulp-sass that I got (a more recent one) was not able to compile the CSS (it was throwing some errors), and you know, No CSS = No angular animations.
Anyways, the solution is to install gulp-sass in exactly the way described here, check out the answer by user @bonatoque. It is of extreme importance that you have Node version: 0.12.x, a different version will cause some Horrible errors while trying to install node-sass and/or gulp-sass.
This is what I discovered, and it solved my problems with animations, steps 1-5 in that post should get you covered, then just run gulp sass
Hope it helps!