I have been running Mavericks server about 5 weeks now and I can report that some things have improved slightly. However WGM was throwing plug in errors every time I tried to edit a users data or change a password etc. so I had nothing to lose by doing some basic housekeeping so I repaired the permissions for the server's main HD. The list of permission repairs was colossal. After this rather than restart I fully shut down the Xserve and rebooted holding the shift key to "Safe Boot" after which I rebooted as normal.This clears out various caches and such as below>
It forces a check of the startup volume, just like the First Aid feature of Disk Utility.
It loads only required kernel extensions.
It disables all fonts installed by the user.
It moves font caches to the Trash that are stored in /Library/Caches/com.apple.ATS/(uid)/ – where (uid) is a user ID number such as 501.
It disables all startup items and login items.
The results were great, WGM was fully operational again and the users logged in on File Sharing pane in Server app were disconnecting as they should when they logged off. Its early days yet but everything seems a lot more stable than before. The Users section in Server app still wont let me edit or add users so i still rely on WGM for this so I think this is a definite bug in Server app. I say this because I created a brand new fully working Mavericks server from scratch as an experiment and with only one network user created on the OD after a day or so the editability and being able to add new users on Server app was lost. This behaviour has been happening on Lion through to Mavericks so I dread the day when we lose WGM etc. and have to rely on Profile Manager