Microsoft put out a security update that broke window ink in photoshop. Uninstalling the update seems to fix it. If you are able to delay updating for a month, do that but not everyone can so it will reinstall the update the next time you reboot so you may need to do it again.
It seems to be the cumulative security update KB4093112 that's the problem. Others are saying there is a patch with wintab and disabling windows ink in the wacom driver but others say it messes up pen pressure.
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The latest windows update (KB4093112) has caused an issue with the Wacom tablet and Photoshop.
You can either - undo the update
Do the following (recommended) :
1. Use notepad to create a text file and type in :
2. Save the file as PSUserConfig.txt in the following location
C: > Users > Username > AppData > Roaming > Adobe > Adobe Photoshop CC 2018 > Adobe Photoshop CC 2018 Settings
3. Go to the Wacom tablet properties and for Photoshop under Mapping uncheck "Use Windows Ink"
4. Restart Photoshop
That is it - all should now work well (you need to do all the above steps to retain pen pressure)
Note : There is a third option. Microsoft made this change intentionally and they have issued a way round it with registry change (see link below). However for Photoshop the PSUserConfig method works.
Currently having the same issue. If this isn't resolved by next month, I'm gonna cancel my subscription and turn to Corel Painter instead. Not as many features, but at least I can get my work done.
Thank you so much! This worked for me.