error while accesing playlists from home in the database

Hello,

for our radio station we have a setup in the studio. That pc runs the database so we can log in from home (version 5.3 beta).
From my laptop I can connect to it and see the playlists (log on with version 5.1.2 in demo mode).
When a dj tries to connect (version 5.2 and 5.3 beta) we get an error message “unknow Class Adcontainer”.
Already removed his firewall and that doesn’t solve the thing.
From his pc we see the whole database.

Somebody an idea what is wrong?
All the help is appreciated.

Please advise the DJs to use the latest v5.3 beta build.

Okay that fixed it.
Thanks for the quick reply.