The dialog prompt simply does not come up. Nothing appears. Same when I try to open a new document. Nothing happens; I'm not given the opportunity to open the recovered file I renamed as .sh3d.

5.7.1 from the app store

I have spent 2 hours building a layout, and went to save. But it won't save. No dialog box comes up. I can't export any files either. The popup window for saving or exporting anything doesn't come up.

I've not had this problem in any other program.

There are no files in ~/Library/Application ...