Opacity
Since updating to High Sierra, I have been unable to adjust the color opacity when filling in color for text/form boxes. The "Colors" box used to have something at the bottom for adjusting the opacity, and, since the opacity is turned all the way up by default, I have no way of actually filling in these boxes with color.
The fix for this issue has been officially rolled out with latest Acrobat update
More details here: https://www.adobe.com/devnet-docs/acrobatetk/tools/ReleaseNotesDC/continuous/dccontinuousoctober2018.html#dccontinuousoctobertwentyeighteen
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Hello,
Our team is already looking into it.
Seems to be the issue due to OS upgrade.Our team is in discussion with Apple.
Thanks for your patience.