I know you just updated the plugin with a fix. I used that one to install with. I don't know if it is some other plugin that might be causing a conflict with this plugin on activation. Just to give you some details, running multi-site wordpress install with buddypress enabled. I didn't network activate the plugin. Gave these errors:
1. Warning: include_once(apidata.inc.php) [function.include-once]: failed to open stream: No such file or directory.
2. Warning: Cannot modify header information - headers already sent by (output started at plugins/app-your-wordpress-uppsite/uppsite.php:15) in plugins/app-your-wordpress-uppsite/uppsite.php:15) in plugins/mobile-device-redirection/mobile-device-redirection.php on line 26
It maybe the last plugin that there is a conflict with mobile-device redirection. Which is okay, you need to know that it might. I see one person who installed the new version had no issues. I was able to deactivate the plugin with no issues.
I have yet to try to deactivate the other plugin and then try this one again. I will do that an update this thread, just wanted to give you a heads up. I know the plugin is not listed as multi-site or buddypress supported. Hey have to try new things, got to help plugin authors as much as we can. I don't know if the UppSite website list plugins besides caching that may cause issue, but I guess this one might be one to add. Update again shortly.