I noticed my animations of my sidebar where not working while using angular:angular-material package together with Angular-Meteor.
When I pasted in the CDN link in my head, it did work. Turned out the package is using version 1.4.4 which apparently is not compatible with the current version of angular material for Meteor (v0.10.1).
So forcing the version of angular-animate to 1.4.3 fixed the trick
In your package file