I’m also having this problem. In my experience, restarting Shapr3D will temporarily fix the problem - the keyboard will again work normally. It seems that merely switching focus to another window causes the keyboard to become unresponsive when switching focus back to Shapr3D. This is repeatable. Launch Shapr3D, select an object, hit esc key, works as expected. Switch focus to any other open window, go back to Shapr3D, keystrokes no longer work, and we get a system beep. This is true even if the other window is a modal window produced by Shapr3D itself. (for example, the “Delete Bodies” modal window.)
For me, happens in Ventura, and now Sonoma. How in the heck did this get missed?
FYI: I’m using Shapr3D 5.471.0 (5829)