RTC - Scheduled Builds Not Running

Hello,

My builds are running fine when I request a build manually, but after enabling scheduled builds, they are not being processed. I can see that the build engine recognizes a request for a scheduled build, but I do not see the build coming through in the builds tab, nor do I get an email notification of a successful build.

Is there a setting somewhere I need to make in order for scheduled builds to be processed? What could be the issue?

Any help is greatly appreciated.

Dave