Recently [for some unknown reason] my default application for opening .pdf documents changed to Acrobat (PM MDD, OS 10.4.2). I like to use Preview, but when I right click on something, Preview is not an "open with" option. When I select "open with other", Preview is "grayed out" indicating it isn't a valid application to open .pdf files with. I can click to over-ride this though OSX thinks it isn't a good app to use. Questions: 1) How to tell OSX it is a valid app to open .pdf files? 2) How to set it as the default for all .pdf files in this case? If I select (from the info screen for a file) Open With ... Change All ... it won't stick and jumps to ColorSync as the default app. Same issue with .jpg and .tiff and ColorSync ... Any advice?