Trying to debug scripts can be a pain in the neck if you are using bundling and Minification to optimize your script size.
I have actually seen a few cases where IE ( 11 ) would not render correctly unless I disabled bundles.
You can still use bundles to have a single place to put all your scripts, but to disable minification you set EnableOptimizations to false as shown below.
Open the App_Start/Bundle.Config file and add the following line of code.
BundleTable.EnableOptimizations = true;
That's all there is to it.
Now the script files should be generated out so you can set nice breakpoints and debug code.
Happy scripting.