How do I solve this rectangular marquee problem with photoshop?

Pyebwa

New member
I do pretty well with Photoshop, but for some reason it won't let me use the rectangular marquee today. I mark my selection, but this warning always comes up: "No pixels are more than 50% selected. Selection edges won't be visible." Then my box disappears and I am back to square one. Any ideas?
 
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