Request not finishing in chrome

I try to implement a profile picture upload with angularjs and bootstrap using ng-flow module. In safari it works fine but in chrome the request just won't work. Its showing me "Caution: the request is not finished yet"

Here is a screenshot:

I tried to disable all chrome extensions etc. but its still not working. Another thing I noticed (I dont know if its related to my initial problem) is a weird missplaced border of a button which also seems to only appear in chrome.

Code from my view:

<div class="row">
    <div class="col-md-12">
        <h2 style="text-align: center">edit your profile</h2>
    </div>

    <div ng-controller="uploadCtrl" flow-init="{singleFile:true}" flow-name="uploader.flow" flow-files-added="processFiles($files)">
        <div class="form-group">
        <button flow-btn class="btn btn-primary btn-sm" flow-attrs="{accept:'image/*'}">Upload Profile Picture</button>
        </div>
        <div class="thumbnail" ng-show="$flow.files.length">
            <img class="preview" flow-img="$flow.files[0]"/> 
        </div> 
        <button class="btn btn-primary btn-sm" ng-show="$flow.files.length" ng-click="save()">save</button>     
    </div>
</div>

Controller:

angular.module("myController").controller('uploadCtrl', function($scope, profileService) {


    $scope.imageStrings = [];

    $scope.processFiles = function(files){
        angular.forEach(files, function(flowFile, i){
           var fileReader = new FileReader();
              fileReader.onload = function (event) {
                var uri = event.target.result;
                  $scope.imageStrings[i] = uri;     
              };
              fileReader.readAsDataURL(flowFile.file);
        });
      };

     $scope.save = function(){

         var image = $scope.imageStrings[$scope.imageStrings.length -1];

         console.log(image)

         profileService.postProfilePicture.postProfilePicture(JSON.stringify(image),function(res) {
            console.log("success"); 

        }, function(error) {
            $scope.error = true;
        });
     };

});

EDIT:

I think its somehow related to the filesize. In chrome all imageformats work if they are pretty small (< 0.5mb or smth. like that, nothing huge).