Altiris issue

In our building we are currently running the altiris deployment software suite. As of about a week ago I haven't been able to deploy any type of image at all. I've tried dofferenc computers and different images and I get nothing. The status code that I get in the session details is "Status Code 107" The image is valid and the drive mappings are set correctly. Can someone think of anything else that might have gone wrong?

Thanks