The tooltip for the tools icons on the left is not shown completely but hidden partly below the drawing views.
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This means that you have OpenGl enabled. When this is the case, the opengl is drawn over the tooltips. If you want to be able to see the tooltips, you will have to turn the opengl off (this will result in slightly slower modeling). I don't know if this is something that can be fixed or not but the only solution which has ever been suggested was to turn off OpenGL.
Oh yes... To turn off opengl, go to edit/preferences and uncheck the box that says something like "use opengl for interactive rendering".