UGL breaks backstretch plugin

I am using the Use Google Libraries plugin because one of the other plugins I am using loads the entire jQuery-UI library in separate files from my server, whereas UGL loads it in one request from Google. However when I have UGL enabled it breaks a jQuery script I am using called backstretch, it works when I use the WordPress included libraries. In the chrome inspector I am getting the following error:

Uncaught TypeError: Cannot call method ‘backstretch’ of undefined

Does anyone know the reason for this? And anyway I can resolve it?

Thanks

Adam

https://www.ads-software.com/extend/plugins/use-google-libraries/