Hello, good news, after mouse driver reinstallation failed to change anything I just quit trying and thought I'd try the game on a different PC at some point or even do a format and reinstallation of OS etc (like the good old days). Before that, though, I loaded the game once more and this time I clicked, for the first time,on the Surealista text instead of Start on the menu. I am pretty sure this had nothing to do with it, but still, game wokred and still works as it should now (even when choosing Start :) ).