Due to some hardware or software disease, my windows 7 machine is presenting it's video with a non-square pixel aspect ratio, approximately 1.2:1, so squares appear as horizontally stretched rectangles. I assumed that this was analog artifact of the monitor, which is more landscape than used to be standard.
However, I recently captured a screen shot of a square and printed it directly from the screen shot utility (SRip32), and to my amazement, it printed as a rectangle. The same square, printed directly by photoshop, prints as a square, as expected.
-- How does SRIP32 even know about the non-square pixels? -- Does this offer a clue what's causing the problem in the first place?
(the underlying problem appeared mysteriously one day a month ago.)