2) I've also modified some templates
3) All work has been done on the "default" style
4) I think I should be keeping an unmolested "default" style and making up my own new style to contain all the changes.
I have found a few things that don't work right, probably as a result of my changes. When I've "reverted" some style change properties, they don't seem to revert correctly. This refers to some font or image properties that don't come back.
I want to re-install the original default style to make sure I'm back at a fresh starting point. How do I do this?