I am pulling BLACK MAMBA

Ok I am going absolutely crazy! First off I am new to the Hub but I’m pretty tech savvy. I have Black Mamba Theme running on my hub and I have followed every instruction in the thumbgen readme to a T … 3 times. Yet my moviesheets do not show up when I load them onto my hub. My folder structure includes the movie, moviesheet, thumbnail and an xml file. I am using the most current version of thumbgen and the most current firmware update on my hub. Please note that the demo sheets that come with the download pack DO WORK. Although mine that I have generated do not. Any assistance with this would be greatly appreciated as I have been researching a resolution for the past few days to avoid asking a *stupid* question.