Debugger history search not updating

Currently a few days into my WebStorm trial, and I'm really enjoying what you've done with the debugger. It's fantastically useful.

The one pain point I'm having is with history search. The ↑/↓ keys do cycle through statements I've input before, but the statements are not updating. My 'debugger history' consists of a few statements cached from my first debugger session, and that's it. The history is stale.  Is there maybe a local configuration setting that might interfere with WebStorm's ability to keep the history consistently up-to-date?