@eleven If you press the End key to move the cursor to the Loop end point, then you might be able to use Ctrl + Shift + G. It seems that once the cursor is outside the Loop range, then the End of Time Selection box becomes disabled. Also, the timeline needs the focus (I can't get Alt - 0 to work in VP-23).
That’s true, Ctrl + Shift + G works right after creating a loop region. But that makes it very impractical to use. I’ll report this bug to the support team.