I really think it is caused by your dpi. Maybe you are suffering from other 
similar annoyances too like pixelated icons. Check with no scaling, if 
things work fine, it is nothing related to DrRacket, and artifacts like 
those you mention could appear on other apps too. You have still several 
options, though, to get readable text without tweaking scaling. Maybe you 
can investigate about updates of your graphic drivers for your OS. Another 
good option is to use a lower resolution for your display.

I have recently fixed exactly the same problem on my Linux 13.3'' laptop by 
doing the latter, in particular by adding a resolution of 1600x900. It 
wasn't detected by default but on Linux we can create custom resolutions 
with ease.

On Saturday, September 9, 2017 at 10:22:37 PM UTC+2, jarosla...@gmail.com 
> Recently I installed racket 6.10 (Windows version) on my new laptop (OS is 
> Windows 10 Creators Update) and I noticed strange gray boxes when writing 
> programs in the DrRacket editor (see picture attached).
> I assume it's related to my  DPI settings which is set to 125% in the 
> Display settings dialog, and the resolution is set to 1920 x 1080 which is 
> equal to real resolution on my 14' laptop screen.
> Since other apps on the same machine don't exhibit any display problems, i 
> suppose this is a bug in DrRacket so I report it here in the hope that it 
> will be resolved in the new version of DrRacket.
> Best regards,
> Jaroslaw Modry

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