I have a similar issue. Upon activation I’m switched to browser for validation, it’s ok and get message that I can close the browser tab, yet upon returning to Photo AI it gets completely stuck — the activation pop-up is stuck and does not allow to click on any of the buttons and most options on the menu are grayed out and unusable. Therefore, I’m forced to close it.
I’m running version 1.3.12 of Photo AI as limited by having an iMac with MacOS 10.15.7 (Catalina). The browser I’m using for the validation on your site is Chrome 120.0.6099.71, but get the same results with Firefox and Safari.
Thank you.