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Am 24.10.23 um 15:33 schrieb Hamid,Idris:

Hi Otared,

Many thanks. Could you kindly open the pdf I sent as well? How does that

look?

Here, on Windows 11, the bars do not appear on sumatra, adobe, or nitropdf.

I checked on MacOS with Preview, Acrobat Pro and PDF Studio – no bars in

your PDF.

But your code gives apparently correct results on my machine,

ConTeXt ver: 2023.09.26 18:19 LMTX fmt: 2023.10.19

Maybe try to re-make the format? Check all files in the log – is there

something from a local/personal texmf tree?

Many thanks, Henning. I tried remaking the format, updating -- to no avail. The log doesn't seem to show anything unusual, no texmf-project files, etc.

Finally, I shutdown and restarted the system, on the premise that some pdf library or other file is acting up. And voila! it seems to work now -- see attached.

It remains a mystery as to what could possibly have caused this problem, or why a system restart made it go away.

Hopefully the problem will not return, but we'll see..

Thanks to all who replied.

Best wishes