Looks like you updated to 1.5 and not 1.4.8. Not sure why but you should have been able to merge changes if that XenBase was installed previous to the 1.5 update. We'll have a 1.5 version soon so may be best to just hang tight.
When you updated did you overwrite your style? Do you have a child style to the style you purchased because overwriting a style will revert all your changes.