Can't connect debugger to android device

Hi everyone !
I'm experiencing a strange and irritating problem with Android builds.
I need to attach the debugger to my application, but it just don't work at all.

First try :
Device : HTC One X (android 4.2.2) / Asus Nexus 7 2013 (android 4.3)
Unity : 4.2.2f1
Monodevelop : 2.8.2
The profiler is working, but my devices are not in the list when using 'Attach to process'


Second try :
Device : HTC One X (4.2.2) / Asus Nexus 7 2013 (android 4.3)
Unity : 4.3.0f4
Monodevelop : 4.0.1
The profiler is working, my devices are listed when using 'Attach to process'. When I it attach, the application is instantly closed on the device, and I have the 'Could not connect to the debugger' error.


I've spend a whole day on this and I don't know what to do. I already tried everything i found on the internet ( like this : http://answers.unity3d.com/questions/456471/monodevelop-debugging-of-android-player-how-to-att.html , it seems to be the same issue as me ).
I can ping my device, it is listed in the adb devices list, the profiler is working, so everything seems ok but no, it just don't want to work. I'm testing on the smallest project possible : single scene, with the default camera and a script attached with only one line to put a breakpoint.

Thanks in advance !

 

Update :

Works with a Sony Xperia U (Android 2.3.7) and MonoDevelop 4.0.1. MonoDevelop 2.8.2 still showing nothing in the 'Attach to Process' device.
Works with the Nexus 7 2013 and MonoDevelop 4.0.1, not MonoDevelop 2.8.2 (I don't know why it works today ?!)
Still not working with the HTC One X, either with MonoDevelop 4.0.1 or 2.8.2.

 

Same here! Profiler working but not script debuggin on Samsung Grand Prime.

MonoDevelop-Unity
Version 5.9.6
Installation UUID: e7bc9fed-4ed8-4ef5-8729-a44bc1638948
Runtime:
Microsoft .NET 4.0.30319.42000
GTK+ 2.24.22 (MS-Windows theme)
GTK# 2.12.26

Build Information
Build information unavailable

Operating System
Windows 6.2.9200.0 (64-bit)​