Webstorm debugging: not stopping at breakpoints prior to callback

I'm using Firefox with webstorm and I'm not having any issues with debugging until I start using callbacks.  When I use a callback the breakpoint in the callback will be triggered, while the breakpoints in the function that initially set the callback function will never get triggered (even if I step through the code).  Is this a limitation of using asynchronous callbacks or am I missing something?  Thanks for your help.

Pete