I'm not sure if I did something or what. I reinstalled Coreldraw and wiped it from the system. I have a default style set that I use between my home office and work office. I have been using it for months. However, last week something happened. My default colors and text keep changing. I also don't have the pop up menu come up anymore where if you want to change the document's default color it warns you. I can't get that to come up anymore. Now if I change the font, it is automatically changing my Artistic Text Default Object Properties without warning.
Try what Eskimo suggest and if it fails to make you happy try creating templates, for using multiple styles it's a crude method but it works easily for simple sets.