The registration system was out of order from 3:16 till 9:57 local time (Toulouse, France) on Saturday 8 April. We are aware that it went down some hours before the deadline for submitting the final versions of the papers (7 April 23:59 time of PaperCept). This has prevented some of you to register and upload papers at last minute. Some solution will be sought in the close future. Meanwhile those who did not register are invited to do so in order to get their upload codes and be ready for paper uploading.