Subject/Person masking tool always gives square mask

[StefanSurkamp]

Whenever  I use the newly introduced person masking tool, or manually select a a subject with the brush, Lightroom only gives me a big, square box.

Did I set something wrong or is this a bug on Lighroom's end?

Here's an example of using the automatic "person masking" tool

<Changed to Windows>

[StefanSurkamp]

I forgot to add some details:

• Lightroom Version Number: v6.2 
• OS Version Number: Windows 11 Home (Build 22621)

Expected result would be a more finegrained selection of the subject/person.

[JohanElzenga · Accepted solution]

Looks like your GPU drivers need an update.

[Rikk Flohr: Photography]

You've selected the Mac OS Token according to your initial post and then later say that is Windows.  Assuming Windows - Johan's suggestion is correct. The fault lies with your GPU Driver. 

[StefanSurkamp]

Yes, I accidentally selected MacOS but I'm on Windows.

@JohanElzenga suggestion worked. Thanks to you 🙂