Wiki editing fails: could not lock repository

Editing the wiki https://bitbucket.org/karlb/penguin-command/wiki/Home fails both over the web interface and via hg push.

The web interface returns "Oops! An Error occurred". Pushing wiki changes via hg results in
{{

{\\ remote: abort: could not lock repository /data/netapp01/netapp01_sas01_09/data/d-414/r-15414/.hg/wiki: Permission denied\\ }}

}