1 - Press next turn, the GNN news appears. Suppose than a new ship is ready. Press "GOTO", you will go into the starport. Now, try to press the "rally point" button: nothing happens. Close the starport, now the rally point request will appears, once, twice, or more times!
2 - In the map, or in the thech tree, press the left key, keep pressed and move the mouse: the map or the tree will scrolls. Now, if you go outside the window with the cursor (galciv in windowed mode, not full screen), when you come back into the map, it will scroll also if you release the mouse button. I'ts a bit annoying.
3 - Reading the manual, i've found that with the mouse wheel i can zoom the tech tree. Unfortunally it doesn't work, and, if you press the middle button, the tree will become mad.