It was working perfectly for a few days. I installed and uninstalled a few things and now it no longer automatically starts when I receive a call. I have uninstalled Callrec with various uninstall utilities and deleted every possible file/folder belonging to it before reinstalling. No luck.

Notably, it also doesn't start on any key press unless I am actually in the application now. This seems like something that happens a lot with other applications, where they fail to respond to key presses and other external events. Surely there is a known solution to this. But have searched nonstop for an answer with no luck.