I have been using NextCellent Gallery V1.9.17 with WP 3.9.1 with no issues so far. However, yesterday all galleries disappeared. No changes to wordpress, nextcellent, or other plugins were made in the last month.
The pictures are still in the gallery folder on the file system, but all galleries are gone.
When trying to backup the database I receive the following error: mysqldump: Got error: 1146: Table 'loupio5_wpprod.wp_ngg_album' doesn't exist when using LOCK TABLES