I had the same problem, fortunately after several attempt i noticed that if i try to manually resize a border of the window, the upper and draggable part of it finally show up to allow me to move the window where i want it to be.
But it's annoying.
Just played a bit with beta 33, and the interface visual has been very polished since last time i played, i like the icons too they makes it easier for the controls instead of the listing.
And the tileset is pretty, though it will take a few days to get used to it, Tome4 has some of the best visuals and interface for a rogue like.
Tried a Cornac berzerker as in the old version i played i had a long run with one, and got killed by the big troll in Trollmire, it looks like the nerf to the loot (in the last version i played, it was not rare to drop insanely good armor and weapons) makes it more difficult now.
But that's a nerf that was really needed, as i remember having used one of the weapon i found very early for the remnant of the game as nothing dropping was any better.
Though it makes you wanting to get a bit more level up while exploring other dungeons before going back to the Trollmire end, as you're then going to deal less damage and get hit with more of them, making Bill much more dangerous than before.