Can't delete WVS job

Hi,

We have three jobs stuck in the WVS job queue which we are unable to delete from within the Job Monitor, including the one which is Executing. One is from a user, two are from Site Admin. Attempting to delete them results in the message: "ATTENTION: One or more WVS jobs were not deleted". We can't delete them as the user, nor as Site Admin. It's not a general issue, since we can publish and delete other jobs (although the queue is stuck since we can't delete the executing job). Any suggestions or workarounds?

Thanks!

Andrew.