Плохой контраст цветов, судя по всему. Слишком "темненько". Поля выводятся темным на темном фоне.

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Note added at 4 mins (2005-02-13 16:39:31 GMT)
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the dissident frogman\'s Propaganda Bureau | Civil Disobedience ...
... shirts. As far as there\'s enough contrast with the black (Therefore, avoid black tees. Black on black means \"not enough contrast\". It ...
www.thedissidentfrogman.com/bureau/000223.html

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Note added at 5 mins (2005-02-13 16:40:38 GMT)
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“Black-on-black” is a metaphor I use to cover a variety of befuddling design shortcomings at the interface between otherwise sophisticated equipment and the user.

It derives from the proliferation of entertainment products that feature black knobs and pushbuttons and black cabinetry or housings. Who thought this up? Minuscule icons or alphanumeric callouts silk-screened or otherwise imprinted on or near the controls in dishwater gray do little to help. In a dimly lit room one needs a jeweler’s loupe to distinguish one button from another.

http://www.todaysengineer.org/June04/backscatter.asp

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Note added at 21 mins (2005-02-13 16:56:30 GMT)
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Получается, это даже не с \"темнотой\" связано, а просто когда цвет выода поля и цвет фона слишком сливаются.

\"Малоразличимые поля\", вот слово.

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Note added at 27 mins (2005-02-13 17:02:57 GMT)
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Плохоразличимые поля