Well, I have had many replies about the first bug you mentioned. Actually it is not a bug. As most of the people, you tried to put a square exactly on another suqare, right? Well, the fact is, that you shouldn't do that. The mouse's hotspot is in the left upper corner, not in the middle. So everything works perfectly, I just have to change the visual aspects of this part, so that there would be no doubts about the location of the mouse's hostpot.
About the second bug - thanks for finding it, I'll try to find out what's wrong. And of course will try to change the graphical design of the menu.