Broken help links since update (12.0.4.460)

We've been using the method described by Peter Grainge (at the link below) for many years for calling the webhelp to a specific topic within the tri-pane window (with navigation pane and toolbar visible):

http://www.grainge.org/pages/authoring/calling_webhelp/using_urls.htm

Basically, calling the help using this method:

startpage?#path/topic1.htm

This week we updated to the latest RoboHelp 2015 version (12.0.4.460) and now this method no longer works. We get the tri-pane window but the right pane shows the startpage instead of the required topic. The help links in the application haven't changed. This is a major issue for us because we have these links throughout our application and we need the right help to show, not the startpage. Not sure if other users that have used Peter's method are seeing this same issue since the update. 

Any known fix for this?

Thanks!!