No just the one installation. Manually uploaded the WP files to the root web folder of the server, then installed the buddypress as a plugin.
No multiple copies, no multisite.
I did have one weird problem when I first installed. I was fooling around with ‘frontend posting’ plugins just before the 1.6 release of buddypress. The database structure broke which stopped the wordpress admin area from working properly (I think because the JS weren’t loading). So I deleted the database entries for buddypress then reinstalled and it was fixed. Then I upgraded to 1.6.
I don’t see how this would cause the problem however.