Problems with text&transparency

Hi. I've had PSP8 for a few months now, and I'd learned how to use it pretty well, and then my computer crashed and once I'd gotten it fixed I reinstalled PSP and all of a sudden I'm having problems with text and transparency. Basically, it doesn't allow me to make an icon with text with a transparent background. I make a new transparent image, flood fill it bright green like I always do when creating transparency, then I go to add text, and when I'm done I go to set the transparency like always, and all of a sudden, different shades of that bright green have appeared around the text! I checked that only one shade of that green appeared in the palette when setting the transparency BEFORE adding text, but after I've added text, it's like shades appear out of nowhere (shades that I didn't use in the text, that is). I tried checking the settings, opacity and everything, but nothing helps. The GIF Optimizer does the same thing. I never had this problem before, does anyone know what is going on? I'd really appreciate any help, it's driving me crazy!