Cubase Elements 6/7 MP3 import issue

Hi guys,

Wondering if anybody has any knowledge of this weird problem. I’ve imported 16 wav files into a Cubase file for a mixing task. No problem. I went to repeat the exercise with 16 MP3 files and it will only import 11 out of the 16. It can be any 11 files (so it’s not a problem with the files) Cubase won’t let me add more! If I drag a file in to the program a loading screen appears briefly yet no file appears! Any help would be appreciated!!