Thank you for your post.
One of our support technicians just reproduced the problem using FileMaker Server 11.0v3 on Mac OS X Server 10.6, so it is not platform specific. Also, the support technician confirmed the ghost user cannot be removed without restarting the server. The support technician has submitted your post along with his findings to our Development and Testing departments for additional review. I will keep you posted when any information becomes available to me.
I apologize for the late reply.
Our Testers have verified the issue and sent it to Development for further review.
Thanks for the reply.
I'm just curious, do you think a patch/hotfix will be released soon? Or will it be rolled up into a bigger release like 11v5?