I’m having the same problem, but I do have blogs.dir as a directory, and it is 775. Also wp-content is 775. & blogs.dir/2 is 775.
I’ve had several permissions related problems today, which my manager has had to solve as they’ve come-up by changing permissions for certain directories.
So this is clearly a permissions issue, but the relevant directories seem to have correct permissions.
…
…
Oh wait. It does seem to be permissions. I just noticed that the owner & group of the 2 directory is “apache apache” – this must be some server settings thing? talking to my admin