Plex Server won't automatically launch (Run)

Hi, I have a DS215j running DSM6.0-7321. I have Plex Server 0.9.16.3.1840-cece46d.

Since updating to DSM 6.0 I find that each day I have to manually start the Plex server.

I can't access the log files as described in the FAQ, however, if it helps, the last line says:-
ERROR - Unable to set up server: basic_string::_S_create. (I have a screen dump of the log file if it helps).

Asking it to run manually works fine.

Thanks

Andrew