Same i too also get that > Error: wrong server response. Details: undefined
Plus i found out that each time i try to upload a image and that error i wrote on this post comment shows up it ends up going into the trash can saying "Image has been removed" error, don't know why it says that and why it ends up going into the trash, I hope the admins here will solve this uploading tool problem soon so that everyone here can start using the uploading tool again.