I found that if you change your user computer account name and home directory name using capital letters it breaks Xcodes canvas preview. All I did was update my user name "jay" and capitalized it to "Jay". Looking at the canvas diagnostic report, the path to the preview file uses a lower case verion of my account name in the directory path to the preview file, instead of the capitalized version. Everything else as far as I can tell seams to work correctly in Xcode with the updated capitalize account name. I tried to update the location path of the Derived Data to a custom path using my capital account name, but this didn't seam to make a difference. Is this a bug or are we required to keep the lower case user name? Thanks Jay. I'm mean jay. 🙂