My v7 server isn't starting up properly, well, at all really.

The log file shows

2014-04-03 10:21:13,135 6449 WARNING ? openerp.modules.module: Ambiguous import: the OpenERP module resource is shadowed by another module (available at /usr/lib/python2.7/lib-dynload/resource.so). To import it, use import openerp.addons.<module>..

Now, having grepped through it all there seems to be a couple of places where import resource is used, I've changed those to import openerp.addons.resource as recommended in the error but it appears to have no effect.

Anyone got any clues that might help me get to the bottom of it ?