After upgrading to version 3.528
There is a problem with nfs connection , mounted disk is available in ssh console as well as all files . But there is no track in the sources section.
The same shows nfs connection - ok
rebooting does not help
try:
sudo service mpd restart
3.528 is an unstable alpha build, please wait for the upcoming new release
Nothing’s changed.
so this version updated itself 
please advise how to return the latest version ?
It didn’t work for me.
there are changes. there are 0 in the columns aritist, album and so on.
But music files on nfs does not see and does not scan
http://logs.volumio.org/volumio/uwa1r64.html
upd
After power off , started scanning the nfs directory
http://logs.volumio.org/volumio/9Z5AXTs.html
Problem with nfs - hopefully solved 
Thanks
ps was my mistake. I enabled Test Mode - True.
I didn’t realize that the update came from the dev branch ( I didn’t see a warning anywhere ) . And now I’m on the test version
thanks for the info