There are a couple of outstanding issues with the BrushDJ project (not caused by you so don't worry!) that need looking into.
1. Screen Refresh
On Android 4 (such as a Nexus7 we have here in the office) then the main screen doesn't always show. This is a known issue with these versions of Android and we actually did a quick fix in the current released version for this that I'll provide so should be a 5 minute fix.
2. Push Notifications
Another developer had updated the push notifications (done using Urban Airship) from Helium to GCM but this doesn't seem to be working on my device. This may be down to the way I have things setup as I don't have any experience of this. Could you have a look and check yourself please and either fix or advise what needs doing.