Online sources cannot be changed

Hello,
today I wanted to add a new online sources to Serviio and realised that I cannot change/update/edit/add/delete anything on the online sources tab.
I am running
Serviio 1.4.1.2
WebUI 1.4 beta
on Synology NAS DS1812+ with INTEL Atom D2700 CPU
DSM 5.1-5004
I guess that probably the file where these data are changed is now read-only. But really dont know where is the file and how to change it... also this is only a guess. Apart from this the server is running well and I can watch the online sources that I have now in the list... just cannot add/delete/edit anything...
Could you please help me?
Thanks!
today I wanted to add a new online sources to Serviio and realised that I cannot change/update/edit/add/delete anything on the online sources tab.
I am running
Serviio 1.4.1.2
WebUI 1.4 beta
on Synology NAS DS1812+ with INTEL Atom D2700 CPU
DSM 5.1-5004
I guess that probably the file where these data are changed is now read-only. But really dont know where is the file and how to change it... also this is only a guess. Apart from this the server is running well and I can watch the online sources that I have now in the list... just cannot add/delete/edit anything...
Could you please help me?
Thanks!