Color of "tool tip" text

Hi, I seem to have inadvertently changed the color of the text of the "tool tip" (the bubble that shows up when you hover your mouse over a button in the GUI, for example when you hover your mouse over the green "Play" button in ADE-XL). The color of the text is black by default and it's changed to white (really difficult to read with the pink background of the bubble!). Where can I set this text color back to the default black? I'm using Virtuoso 6.1.7. I'm assuming it's set somewhere in the cdsinit or cdsenv file but I can't figure out how to change this Thanks, Shaan