The “flying gray strip” appears in “Spectrograms/Going from spectra to a spectrogram 4” disappears on subsequent pages. What’s wrong?
A. Generally, this is due to video acceleration features on various graphics controllers. Since the flying strip is made by painting the gray shading and then “unpainting” it, some controllers appear to optimize away the operation. This is especially prevalent on PCs that run fast enough that the paint/unpaint operations would occur within a single video frame time (typically 1/30th of a second.
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