I'm on linux and I cannot use the "space" key to paus/unpause and the default keybindings for the map, inventory, character, aso. What does work is stealth (Ctrl), the tab key and escape. When I try to set a keybinding only a few keys work and none of the letters (it just stays "Set" and waits for input).
I downloaded the game from GOG.
I tried to attach a Player.log file to this post, but I get a "Error You aren't permitted to upload this kind of file"