Nenhuma das funções, sja healing, Ai or Stamp estão a funcionar para remover mancha de sensor. Fica a analizar imenso tempo, termina e nada acontece.

Hey, ​@missroofless. Welcome to the Lightroom Community. I'll need more info to help you figure this out. 

Please share the system information from Lightroom Help > System info > Copy and paste into a text document > Upload and attach here.

Does this happen after a series of steps, with a set of images, or have you installed Lightroom on this machine for the first time?

Awaiting on hearing from you. Thanks!
Sameer K