We have several DELL Precision machines with ATI FirePro GPUs and AMD gDebugger 6.x works only on the most compromised one (the one with Win8 Release Preview installed).
The problem is simple: when you start the app within the gDebugger you have no output and you cannot even Suspend the execution (F6).
You have a call stack in gDEBugger which tells you what’s currently happening and if you’re app starts up as expected. You should get at least some kind of response regarding successful start-up, crashes etc. I suspect it simply goes down before any user input is processed.
Edit: BTW, Windows 8 is definitely not a prerequisite for running gDEBugger. It runs fine on Windows 7 and Vista too - at least it’s supposed to. You’re lucky you’re not on Linux.