2:50 PM ET: We are receiving widespread reports of intermittent errors when publishing content to your Sharepoint instance. This appears to be a Sharepoint level problem (Exception from HRESULT: 0x80131904). We are looking into this issue.
3:38 PM ET: It currently appears that this issue is confined to saving pages and a subset of our customers. Microsoft has acknowledged an issue in rendering the MMD tree - unable to get termset.