PSUserConfig stopped working

See here:

https://community.adobe.com/questions%2D712/psuserconfig%2Dstopped%2Dworking%2D1645219

Brush preset thumbnails lose pressure taper when Photoshop is launched with mouse instead of Wacom pen (regression)

Hi, I've found a consistent behavior with brush preset thumbnails in the Brushes panel:

WHAT HAPPENS
- If I launch Photoshop by clicking its icon with my MOUSE, all brush preset
  thumbnails (e.g. Kyle's Manga brushes) render as FLAT, uniform strokes —
  no thin-thick taper. (screenshot 1)
- If I launch Photoshop by tapping its icon with my WACOM PEN, the same
  thumbnails render WITH proper pressure taper (thin-thick). (screenshot 2)

WHY IT MATTERS (my workflow)
I choose brushes based on their stroke shape in the thumbnails. With flat
thumbnails I have to guess what each brush does; the tapered preview shows
me the brush character at a glance.

REGRESSION
In older Photoshop versions I could fix this mid-session: touch the pen to
the tablet, close and reopen the Brushes panel, and thumbnails would
re-render with taper. In the current version this no longer works — the pen
isn't picked up as the active device after launch, and thumbnails stay flat
until I restart Photoshop via the pen.

TRIED, DIDN'T HELP
- Toggling Windows Ink in Wacom Tablet Properties
- UseSystemStylus 0 in PSUserConfig.txt
- Pen pressure while painting works fine in both cases — this is purely a
  thumbnail preview issue.

EXPECTED
Thumbnails should re-render with pen pressure once the pen is used, as in
older versions — or there should be a way to force it without restarting.

SYSTEM
Photoshop [27.1.0], Windows [11], Wacom [Intuos M Pro],
driver [6.4.13-4]
 

Guillaime has some info on this on the Lazy Nezumi News page.  Not much help if you are a Mac user.

Lazy Nezumi Pro 2026 News

See here: 

Summary
Pen pressure doesn’t work in Photoshop 27.11 (the current release) on a Wacom Cintiq Pro 24. Strokes draw at full size and opacity no matter how hard I press. Rolling back to 27.3.1 fixes it right away. Pressure works in every other application, so the driver and hardware are working. Other users have reported the same issue starting in 27.4.

Environment

• Photoshop: 27.11 (broken), 27.3.1 (works)
• Tablet: Wacom Cintiq Pro 24 Pen & Touch (DTH-2420)
• Wacom driver: [version find it in Wacom Center > Help > About]
• OS: Windows 11 Pro, build 26300 (Insider)
• GPU: [model and driver version]

Steps to reproduce

1. Install Photoshop 27.11 with the Wacom driver above.
2. Create a new document and select the default Brush tool.
3. Turn on pressure for size and opacity (in the options bar and in Brush Settings > Shape Dynamics and Transfer).
4. Draw strokes with light and heavy pressure.

Expected: Stroke size and opacity change with pen pressure.
Actual: Strokes are uniform. Pressure is ignored.

Already tried (none fixed it in 27.11)

• Reset the Brush tool and checked Pen Pressure controls in Brush Settings
• Turned Windows Ink on and off in Wacom Tablet Properties
• Forced WinTab with PSUserConfig.txt (UseSystemStylus 0)
• Restarted the Wacom service and reinstalled the driver
• Reset Photoshop preferences

Workaround: Roll back to 27.3.1 via Creative Cloud > Other versions.

Related reports: [link the existing 27.4 forum threads]

Hi ​@Firanka 

Thanks for reaching out. Here’s a detailed thread on this topic: 

Hope this helps! Please let us know if you have any further questions or continue to experience the issue.