UPnP bindings hang when app moves to front
0 libsystem_kernel.dylib 0x39624fa8 __psynch_mutexwait + 24
1 libsystem_pthread.dylib 0x3968bf0a _pthread_mutex_lock + 302
2 Foundation 0x2f65ce56 -[NSRecursiveLock lock] + 10
3 VLC for iOS 0x0067342a -[UPnPDB removeObserver:] (UPnPDB.m:101)
4 VLC for iOS 0x0012115a -[VLCLocalServerListViewController goBack:] (VLCLocalServerListViewController.m:121)
5 UIKit 0x314e4f3a -[UIApplication sendAction:to:from:forEvent:] + 86
6 UIKit 0x3164c658 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 116
7 UIKit 0x314e4f3a -[UIApplication sendAction:to:from:forEvent:] + 86
8 UIKit 0x314e4eda -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
9 UIKit 0x314e4eb4 -[UIControl sendAction:to:forEvent:] + 40
10 UIKit 0x314d0b3a -[UIControl _sendActionsForEvents:withEvent:] + 370
11 UIKit 0x314e492a -[UIControl touchesEnded:withEvent:] + 586
12 UIKit 0x314e45fc -[UIWindow _sendTouchesForEvent:] + 524
13 UIKit 0x314df688 -[UIWindow sendEvent:] + 828
14 UIKit 0x314b4a20 -[UIApplication sendEvent:] + 192
15 UIKit 0x314b321c _UIApplicationHandleEventQueue + 7092