Customized Template report stoped showing data for one master server

On Saturday (two days ago), OpsCenter's reports stoped sending data on one of our master servers.  The reports still go out fine, but this one master is missing from the report.  I've run the reports manually while loged into OpsCenter, and get the same result.

I've checked data collection, and even disabled, and enabled it again, but that doesn't appear to be the issue.  This is only affecting the reports.  The data is showing up when monitoring that enviorment from OpsCenter.

Any suggestions on what I might check next?