not at all, as you show way more input here as in the jpeg ... so first
make a minimal example

I did gave a min-example, didn't I? The JPG was only to make clear, what I mean with "little signs". Is that clear now? Dont know how to say it better way (sorry my english) :),

also "another font" is not revealing either
Of course it is not, yes, sorry. But sometimes I have problems with different fonts (e.g. the letters are not connected), and these problems do not occur in CorelDraw or some other programs. That is, what I meant. (Besides from that, it should be clear that I am a very big fan of ConTeXt and all the way I am talking about it to friends and collegues, so: no attacks at all :)).

the only issue i see is that this otf font has 2048 units and gets
scaled wrong (in luatex's backend probably)

The problem is not the scaling (may be too, but not my problem here). Don't you get the following problem in this (your) code?

\definefont[arabica][file:uthmantn1ver10.ttf*arabic at 45pt]
\definefont[arabicb][file:arabtype.ttf*arabic at 45pt]
\starttext
\setupalign[r2l]
\arabica شَدِيدٌۗ\blank\blank
\arabicb شَدِيدٌۗ\par
\stoptext

Maybe its an issue of my context-version, so see the attachment. With the font "arabtype" everything is fine, with the font "uthmantnver10" the sign is missing.

Huseyin

Attachment: context_missing.pdf
Description: Adobe PDF document

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