I was getting the follow error: Broken/Missing handler Views 3
And so tried to upgrade to the latest dev version of Heartbeat as was suggested at the above issue. Here are the steps I took:
- put site into maintenance mode
- made backup of heartbeat module
- copied and replaced 7.x-1.0 with 7.x-1.x-dev under sites/all/modules
- tried to run update.php

After copying over the files when I now try to go to the module admin page or run update.php I get an "webpage is not available" browser message. If I delete Heartbeat Dev and put back the 7.x-1.0 version, everything is fine again. Am I doing something wrong or is this a bug?