Board Thread:Questions and Answers/@comment-5914944-20121227004238/@comment-114.72.168.177-20121227120123

Don't worry about the metadata not found thing, that's normal. It's like that for me, and I'm guessing a lot of other people as well.

And for not enough items being invisible when you've maximised the window, press "o" when you're in your inventory and NEI should appear again. You can press "o" any time when you're in your inventory to show and hide NEI.

Hope that fixes it and hope I helped! :)