I’m not sure what that could refer to. Perhaps you have files that have moved and can’t be found? Perhaps try starting with an empty project and adding things back to see if you can pinpoint the issue.
Same as any other project: Image Sets. Just drag the images into the project. I think all supported iOS devices are retina now so you’d only need 2x and possible 3x sizes.
@Richard Albrecht I have an Images folder within my project and Xojo creates an Images folder within the project folder on my Mac to match this and for each Image Set I first drag three of the correctly sized images into this physical folder and then, after creating the Image Set in the Images folder in Xojo, I drag each image from the physical folder to the appropriate position in the Image Set. The result is that my Images folder contains an Image Set plus three .PNG files for each image I use.
[quote=399063:@Richard Albrecht]I don’t see this in the menu or preferences.: changing the Destination in Xojo > Build Settings > Shared > Debug > Destination
I see no build settings?[/quote]
In the Navigator.
Xojo Navigator (on the left), scroll down > Build Settings > Shared (click)
Xojo Inspector (on the right) > Debug > Destination (select a folder outside of Dropbox sync folders)
You could also try resetting the iOS Simulator. From the Simulator app, when it’s running, select Erase All Content and Settings from the Hardware menu.