Whole notebook deleted!

[Mohammad Asif ul Haq 0]

Just found out that my most used notebook in evernote, with over 600 notes, all tagged, is moved to trash! I'm pretty sure I didn't do it. It's my most active notebook, there's no reason for my to delete it. In fact, I don't even remember any of the notebooks I created. I hope someone can explain how this happened. I managed to restore the notes from trash, but all the tags are now gone.

[CMAP 2]

Do you use Penultimate?  I had this happen and it was because I had created a Penultimate notebook with the same name as an Evernote notebook, deleted it in Penultimate which caused it to be deleted in Evernote.