Thank you for your post.
Unfortunately, I am unable to duplicate the problem on my machine using FileMaker Pro 10.0v3 Advanced running Mac OS X 10.6.1 (Snow Leopard).
Do you have access to another Snow Leopard machine? What font are you using? What color are you using? I've used Red, Yellow, Blue, lime green, purple, etc.
Any other information you can provide to help me duplicate the problem would be appreciated.