Photoshop CC 2018: I am not able to define the size of my brush with my wacom pen

Thanks for the added information, Deniz. Can we try the previous Wacom driver and see how it interacts with Photoshop? 

To uninstall the Wacom driver on Win 10:

• Disconnect the tablet from the computer
• Press the Windows key on your keyboard, along with the X key, to bring up the Utility menu (in the lower-left of the screen)
• Select Programs and Features in this menu
• Uninstall the driver, which may be listed as (depending on model and version):
  • Bamboo
  • Pen Tablet
  • Tablet
  • Wacom
  • Wacom Tablet
• Restart the computer to complete the removal

To get a new driver - scroll down to Windows - Driver 6.3.25-5 (Win 7, 8 and 10*): http://www.wacom.com/en/support/product-support/drivers 

Thanks,
Hannah

So, the problem still persists. Very annoying and CC2018 seems to have so many small bugs it sometimes drives me crazy.. Anyway, my tip for everyone: uninstall Windows 10 fall update (1709), go back to previous version and it seems to do the trick. So I will have to wait, once again, until a permanent fix is available. Whoever will release this patch (Microsoft, Adobe or Wacom). I will subscribe to this  and hope someone can write here if a fix is available.

Have the same terrible bug. I'm quite disappointed in wacom/photoshop policy. This is just one of basic required features, and if it doesn't work - I don't know what to add. Shame.

FCK them all. I spent a lot of money for professional equip. (hardware and software) and now this?
1 month ago was everything without problems (after idiotic fall updates) 14 days ago was the problem back, 2 days ago  (without any my action) was my pen working all right and today I can't change brush size again. I'm uninstaling CC, stop paying and go to steal CS 6 - No updates, No problems.

I have the same problem, I tried to dissable the "use window ink" and the brush resizer works with ctrl + alt + right click, but then the pen pressure drops...it's so frustrating

guys follow the "PSUserConfig.txt" method and if it doesn't work try to make the name of the file "PSUserConfig" without ".txt" and keep "use windows ink" checked in Wacom Tablet Properties in mapping tap

Hi.

Does anyone have any news about the issue being fixed? The way I dealt with the issue was to uninstall Microsoft Windows 10 fall update (1709), which apparently broke Windows Ink or dramatically altered its behaviour. But the bad news is my O/S is lacking behind in security patches, as I can't update to 1709.

It is not fixed. You still have to create a configuration file. I have found help here: https://feedback.photoshop.com/photoshop_family/topics/windows-10-update-has-broken-wacom-pen-right-...

Unfortunately that "fix" is not a solution for me. If I do that I basically loose the pressure sensitivity which is not an option for me. I would hate to loose 8192 levels of sensitivity  So, I guess it is just more waiting and not update my Windows 10 for a while. Real bummer.

Tmuussoni,

Just to be clear on the steps that you took, you:

1. created the PSUserConfig.txt file
2. disabled Windows Ink

Do you know which of those steps caused you to lose pressure sensitivity?

Thanks,
Hannah

Bump!
Please fix that :)

PSUserConfig worked for me after deleting .txt , letting Windows Ink checked and disabling Pen circle.