Ornamental Tree 1 texture is gone

I have a problem. It seems that the standard Ornamental Tree 1 texture in my NL is deleted or replaced. Now I can't delete or move the tree object in the editor (it's invisible in the editor) and in the simulation I only see 2 white textures instead.

Does someone know how to fix this?

simple, reinstall NL

problem solved

I can't argue with Gazag's suggestion (wow, how in the world did he come up with that? )

it took me 10 mins to think off that

just take the advice of my avatar

haha, it's simple and yet effective.

I thought about it myself but for somehow I thought I would loose my tracks or other custom data, like they are plugins or something.:S

Anyway, it worked! Thnx gazag!

...The idea of a true genius...