I've just updated VDR to version 1.4.2. Although everything seems to be working, this message appears in syslog as VOMP boots:
vdr: [20841] ERROR: plugin '<no name given>' called cPlugin::ConfigDirectory(), which is not thread safe!
There is mention in the VDR release notes that this message was added in 1.4.1-4 but not what the reason is or how to fix. VOMP does indeed call this function in both mvpserver.c and mvpclient.c.
Dave