Bug: New interface import contacts 'previous' button is broken

When you import new contacts via the new interface and after you have mapped the proper fields and get in the screen where it tells you which fields and columns you didn't map and press the Previous button it shows me a white screen and i have to do the import process all over again. This doesn't happen with the old interface.

PS: I think the new interface sucks. I also reported this when i was asked to give feedback on it but never got a response. Visually it has too much white and fields can't be clearly identified as with the old interface. Will the old interface be disabled eventually? I hope not. I hate that i can't set a preference and get forced into the new interface right now...