2.0.5 update problems

Two blogs. Updated tiggrsuccess.com/blog/ to 2.0.5 with no problems.

Tried the same thing at pdaoutlet.biz/blog/ – poof. All my ~900 entries are gone – sort of. If I Manage/Posts/Edit (e.g., http://pdaoutlet.biz/blog/wp-admin/post.php?action=edit&post=919), the post shows up in the edit window. However, if I Manage/Posts/View (e.g., http://pdaoutlet.biz/blog/2007/01/01/i-blue757-solar-powered-gps-receiver/), I get a 404.

Where did they go?

Thoughts most appreciated.