mocha-istanbul | Mocha reporter to generate coverage report | Dashboard library

I have been using PhantomJS as the browser to run my karma tests using grunt-karma. I am now trying to switch to another browser, but I am getting an assortment of "Invalid Chai property" errors when running the tests, which seem to happen on lines using should assertions, such as "foo.should.be.a.function;" I have tried a number of things, but nothing fixes it, and there doesn't seem to be any preexisting issues addressing this. Here is my package and karma.config. Note that I've shortened both lists. I should also add that I have tried updating all testing-related modules to their latest versions, since I know some of them are a couple versions behind, but this had no positive effect, so I reverted.