Are you sure that you haven't accidentally tapped on your caps lock key? :winkytongue: The "h"-key works only when caps lock is off.
In case you haven't, then it may be a problem with your graphic card drivers. You could try to update or reinstall your graphic drivers and in case it doesn't help, try to switch the game from the default OpenGL mode to DirectX mode or software rendering mode. Just hit shift-g and select another renderer, restart the game and try to play.
In case both DirectX and OpenGL are problematic, you can try the software renderer, but be aware that it is slow even on fast computers and it would make sense to switch off transitions from the preferences menu while in software renderer mode.
You can also minimize the use of the h-key by using the patch in my sig that removes dialog box background.
Thanks for the advice, but i found a way to minimize the "malfunction".
To hide the text i can hit H or tap the middle mouse button. The problem only occurs when I use the mouse to hide the text, when I use H nothing happens. It still happened once,but just had to reload an older save, where it still worked.
Nonetheless, Thank you for comment.
My laptop is a bit old, so you could be right about the graphic card
But because this only happens in around 1 in 10 Renpy games, it's not such a big deal for me and with my new "technique" I can overcome the problem.