Mask stuck loading

[KristenLynnn]

Since this new update- whenever I try to use the masking tool it just loads and it doesn't apply what I have done, my picture is stuck in "loading/applying mode" then when I click off the picture and back onto it I can't even get my picture to load to edit it. 

[dj_paige]

Are you talking about Lightroom (Lr icon) or Lightroom Classic (LrC icon)? What version NUMBER? What operating system version NUMBER?

[KristenLynnn]

Lightroom Classic. Version 11.4.1

[Rob_Cullen]

Which "Masking Tool"?  Brush, Gradient, Sky selection, Subject selection.?

Is it the 'Sky' or 'Subject' taking its time to locate areas by its AI functions?