It's a writing program, don't know how many of you might use it... I won't open it's own files under 10.5.4. Well, it opens them with no contents and all the buttons disabled. It also, when creating a new document, renders that useless too. I checked the package contents of the documents (they are stored that way) and 10.5.4 appears to have added a file called info.plist. Which says: I have a copy of the files on my MBP, which is still at 10.5.3, and that's not in the packages (documents) and they run fine there. Very confused, though I *think* it may have something to do with the dictionary... Grrrr.