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At power up, I open the file manager Nautilus, then I minimize the manager's window. Coming back to it, minutes (30? 20? 10 minutes later I'm uncertain exactly how long) shows the outline of the window. But all the icons are gone. I then must close that windows and open Nautilus again, in order to see the files/objects/sub-directories, et cetera.
See attached screenshot, please.
From what I see, you do not have ubuntu 13.04 installed. Backup, then upgrade, to see if you still have an issue.
If it doesn't work, or if you can't upgrade for any reason, go to another directory in the sidebar, then switch back to the directory you were viewing.
I won't upgrade just now. I really like the 12.04 LTS. Everything is working. Most everything. I report this more for the Devs as an FYI, then it really matters if I close and open the file manager Nautilus. Thanks.