[BlueOnyx:15505] Site prefix not added to new users

[Frank Soyer]

Hi list,
one of my users found this morning what seems to be a bug : the site 
prefix (on existing vhosts) is no more added to new users created. After 
verifying, I have this issue on all my servers. I don't know when this 
bug appears : last update ?

Going to a vhost on GUI and clicking on "Save" is enough to settle the 
problem. But, difficult to do that manually on dozens of sites...

Thank for all suggestions.

Regards,
Frank Soyer