Blog down. No "blog" tab on site navigation.

Website: http://www.thinkpackage.com
Problem area: http://www.thinkpackage.com/blog
Enabled themes: Theme by hired developer (default theme); Bartik 7.14; Seven 7.14

1. “Blog” tab missing from website navigation.
2. Title of blog website changed to title of last attempted blog post.

Cause:
I usually post blogs by going to the dashboard -> Content -> Add content -> Blog post. HOWEVER, the last attempted blog post was accidentally uploaded by clicking on the “Blog” tab from the main page, then clicking on “Edit” at the blog page. After writing the body text and uploading photo for the post titled “MAISON KAYSER UES OPENING”, I proceed to upload the post itself. At this point, all previous blogs were missing from http://www.thinkpackage.com/blog, and title of <www.thinkpackage.com/blog> changed to “MAISON KAYSER UES OPENING” from previous “Blog | PTI Packaging”. Content seems to still exist internally but does not show on blog website.

Cannot post new blogs by “dashboard -> Content -> Add content -> Blog post” method.

Please advise.