I've seen this on multiple boxes. Initially I thought it was simply due to the hostname difference between the source LMS and target. But now that the LMS 3.1 server has taken on the hostname of the LMS 2.6 server, it no longer makes sense. Basically, I get an email:
Job Id : 1751
Job Instance Id : 172
Job Type : Unused Down
Description : switch ports unused
Status : Failed
Start time : Mon Dec 01 15:00:37 EST 2008
End time : Mon Dec 01 15:00:40 EST 2008
Server : lms-server-hostname / 111.222.333.444
Error(s) : Save Switch Port Usage-Unused Down Report failed
However, the report is listed as "successful" on the Common Services homepage, although clicking on the report ID returns "The report is not available" which corroborates that it has actually failed.
1751.172 Switch Port Usage-Unused Down switch ports... Succeeded 01 Dec 2008, 15:00:41 EST
I really hate this widget. It has a limit of three characters. So, if you have 180 in there, just hit delete three times, then type in 90.
According to the log, that's exactly why. The old report names from LMS 3.0 are supported, but not those from 2.6. The jobs will need to be recreated using the new 3.1 reports.