Please, let us all know if/when you do get a response.
Here's the response I got from Geocaching.com:
Hello Tom
Thank you for reaching out to Geocaching HQ. We are aware of the Caches along a Route issue and are currently awaiting a release that'll resolve it. Thanks for your patience and look for a fix soon!
Please let me know if I can help you with anything else.
Janelle
Geocaching Community Manager
Route Queries are working now.