The future versions of CodeXL will have support for Win8 enabled.
This should solve all the problems that you are facing.
I'm getting mad trying to use gDebugger. I hope you can solve your problem just with another version of OpenCL (I guess not, but just thinking about the time I'm spending trying to fix it! Many, many unresolved problems!!)
To have OpenCL 1.1, I think you should install AMD APP SDK 2.6. Previously I was programming with OpenCL and printing the Platform and Device Info I noticed "OpenCL version: 1.1", then I moved to SDK 2.8 and I noticed version 1.2. This should work, I guess.