Thanks for looking! - I had indeed managed to get it working when I realised that the reason for "only logo" was that all *modules* were not activated yet - I guess this had not quite worked during the installation routine (strangely there was a success message for having installed the modules). When I realised, that it was to do with modules not being activated I ran the installer (/install) once more and I think I had made the modules dir 777 for that and then all the modules did get activated!
Sorry that I only got round to writing this down now. So for other users in future who have the same problem of only the logo displaying: check if any modules are activated in the back office (/admin).