Photoshop CC 2018: Polygonal Lasso Tool Auto-completes unexpectedly

Hi Jake. Actually, you can disable Windows Ink and force Photoshop to use the old WinTab driver to enable pressure sensitivity in a Wacom tablet.

Just follow this instructions from the Adobe forum (https://forums.adobe.com/thread/1501276):

1) Disable Windows Ink on the Wacom preferences app;

2) Create a text file in a plain text editor such as Notepad;

3) Type in the following lines:

# Use WinTab

UseSystemStylus 0

4) Save the file as a plain text file named PSUserConfig.txt, and save it into the Photoshop settings folder: C:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC 2018\Adobe Photoshop CC 2018 Settings\

5) Restart Photoshop and test the brush, it should now recognise the pressure without Windows Ink enabled.

Hope that will help with the Lasso problem too.

Good luck!

 

HOLY CRAP!! This works! I think there are a ton of people who are actually struggling with this problem and just don't know a fix for it.
Is there any upside to using windows ink? so far I've found nothing good about it and it breaks so many programs. 
Thank you for this! 

double click completes a polygonal lasso, so perhaps something about your stylus motion triggers a double click.  Are you sure the stylus tip is not contacting the digitizer?

Haha that's what someone who isn't experiencing this problem would say. But it's not just me and it's across the art department that I direct. And it's something that has started within the last few months after 10 years of using cintiq's and wacom products at this location and at home.
So it's not just me. Also to test we've turned off hoverclick and double click settings and messed with the click distance etc. It's super random but would occur between 1 and 8 clicks like clockwork. 

thanks for confirming.  I don't have any suggestions at the moment other than being sure your Wacom drivers are up to date, but I'm guessing you thought of that.  At Adobe we've seen some problems with Wacom hardware and have resolved some not too long ago, so let me check with the relevant engineer.  

Did the trick for me, too. Asked GOOGLE "photoshop cintiq lasso". Second suggestion. Huge THANX!

I had the same issue and nothing worked. I contacted Adobe technical support online chat and they sorted this issue within 2 minutes :) BLISS, because it was very frustrating.