Unable to move my character

Hi,

I created a character, I used the keep to modify the world state (I finished many times DAO so I chose one hero for that) but I am now stuck !
I must miss something evident but I cannot move the character in the game, even after the patch (game is up to date according to origin). When I scroll the view changes a bit but the left/right button do nothing and I cannot move. A problem with my mouse ? Inverting the buttons did not help. I never had such a problem with BG, BG2, IWD, DAO. I play on a mouse-only PC, I don't plan to use the keyboard or a pad.
Best regards
PF