Yes, I do. It is quite a puzzle. I'll have tiffs side by side with other tiffs in a file and C1pro will see them all but one. at first I thought it was something I was doing and rechecked and rechecked. LR and Photoshop both recognized and opened the file, but try as I might, C1 would not. I compared the file name etc with others that were being read--finally I just duplicated the file to another location and C1 read the dupe fine, but the mystery still there. This hasn't happened but a couple of times to me and I think only with older files. Since Duplicating the file seemed a quick and easy solution to a very rare occurrence, I moved on, but if you discover what the problem is, please post as I am curious.