Yes, I thought about that last night and have verified that all of the paths are lowercase. In fact, I had to do that just to get the "Invalid XML data"; before I changed everything to lowercase the page did not even show that there was supposed to be something in that space.
I'm assuming that because I'm getting the error message then there is something incorrect with the XML file, but I've checked over it 10 times and cannot figure out what it could be.
Any additional ideas?
Thanks!