Hello Chris,
Thanks for your answer. I don't know how long it has been happening, maybe some weeks. Most of time I just open existing documents so it is possible that I didn't see it for a while. I use the last retail version (1.8.5.703)
Your suggestion to remove the 1.0 directory worked perfectly. I doubted that it would work because I had the same behaviour for photo and designer so I thought that it had to be something common to both. But I was wrong, it was just the same problem twice.
Thanks a lot