I just installed Avast Mac Security 2015 for the first time on my Mac, running Yosemite.
Although Avast seems to be running fine, when I try to disable one of the shields (e.g. Web Shield), or a feature of a shield (e.g. Scan secured connections), I am prompted for my account password, and then I’m shown an error:
Authorisation failed.
The operation couldn’t be completed. No such process
Is this a known issue?