Webinterface of Turris Omnia broken until "rpcd restart"

i hope, someone can help me.
I’m using 4.0 beta 1 and i’m having a problem (i think after i change the partions / mounts - not from the beginning of configure of the router, so i think, it’s not a 4.0b problem?!):
Starting screen works (Turris-IP), when i choose:

Unhandled Exception

An unhandled exception was thrown by the application.

/usr/lib/lua/luci/dispatcher.lua:230: /etc/config/luci seems to be corrupt, unable to find section ‘main’
stack traceback:
[C]: in function ‘assert’
/usr/lib/lua/luci/dispatcher.lua:230: in function ‘dispatch’
/usr/lib/lua/luci/dispatcher.lua:127: in function </usr/lib/lua/luci/dispatcher.lua:126>

/etc/config/luci seems to be corrupt, unable to find section ‘main’
It’s not correct, ‘main’ exists!

When i do “/etc/init.d/rpcd restart” the Webinterface works for short-time:
I must do a login again, and can see the last page, if i want to go to an other LUCI-Page, the Webinterface gone or when i push an e.g. “Save&apply”-Button.

Which Log’s are needed?

(Thank you :wink: )

Topic can be close, because:
It’s 4.0Beta-Problem(?!), when i delete the LXC-Directory from my old Turris-Installation, i can’t reproduce that Problem anymore (there are an 4.0b-Ticket already open, that the LXC-Implementation will be changed).