What version were you playing and do you remember where abouts it happened? :o Like what was going on before it?
I've only been able to test the windows versions and that didn't happen for me when I played through them fully several times. But I only have one PC to test on, so it's possible that stuff might mess up on different screen resolutions and stuff. If I can manage to replicate what happened on my end, then I should be able to find out what the issue is and fix it :3
Also, the textbox is supposed to disappear for a bit in certain parts of the game where it's not required, but clicking is still required to proceed through the scene itself.