he forms people picker is working for some users but not others. For one user it will just spin. Same PC logged in as a different user works., The forms people picker is working for some users but not others. For one user it will just spin. Same PC logged in as a different user works.
as the people picker is working for some people but not for others it might be a good thing so discuss this with Nintex support.
However in both cases the behaviour should be the same for both logged in users so I suggest you open a ticket at Nintex support.
For somebody that it is not working check the permission levels of the user who has opened the form open. Check both at the site level and the parent level site / site collection level.
I've seen it, that although an end user had contribute-no delete access at the site level, I had to alter their site collection access to contribute - not ideal.