Original quadprox-mobile app stopped working with Proxmox 4.
I found out, that just the URL changed from /vz/ to /lxc/. After changing this fantastic app started working again.
I added my self-compiled version which stopped working with Proxmox 3!
Please try out: QuadProx Mobile_it.quadrata.android.quad_prox_mob.apk
Regard erdo