I have the same problem. the homepage is distorted.
I did all 3 things
1. change theme in System->design= add design
2. set up new theme in system->Configurations->Design->Themes="hellomix"
3. Refresh cache and index several times
I installed manually through ftp by dumping all 3 files into the home directory.
Normally I upload each file straight into each source file. But this time, I just dumped all 3 files into the home directly.