Artboart Size arrow key increment not working for the width
when resizing the artboard using the 'Artboard options' panel it is possible to increment the size using the arrow keys, one MM at a time for example. This feature now only works intermittently for the width field. It is still possible to change the number and the artboard will adjust.
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I note the same issue. It is not possible to increase or decrease the width using the up/down arrow keys. Height can be adjusted using up/down arrow keys however.
You can still adjust artboard using the top menu bar - just not via the Artboard Options panel.