Simple Water problem

[Petalcakes]

Hello there,

Ive been using Corel Painter X for a short while now, and i was colouring a drawing with the Simple water brush. Everything went fine, i saved and reopened every day to edit, but when i opened the .RIF today the image changed. There were dark dots in the colouring, and ive no idea why. The backup .RIF has it also, and a copy i made 2 days ago as well. I uploaded a jpeg of both versions, dont mind the purple lines in the background, theyre part of the initial sketch. Have the pixelated flaws something to do with the paint drying, or is this a bug?

Image when it was still right:

http://i232.photobucket.com/albums/e...tie/Yoshi1.jpg

Image after the darkened edges appeared on Yoshi's right shoe, baby Mario's leg and Yoshi's eyes.

http://i232.photobucket.com/albums/e...tie/Yoshi2.jpg