I'm out of time to work this today but I'm stuck with the startplasma-x11 stdout/error showing:
QProcess: Cannot create pipe (Too many open files)
Everything falls to crap in the log after this wrt "Failed to register with host portal" -> "Could not register app ID: App info not found" type errors which is either a red herring or useful.
I've got the base config for open files in login.conf and sysctl.conf set to ridiculously large numbers so I don't think it is a ulimit type thing? Or I'm missing something elsewhere.
Maybe turning away from it for a while will help.
