Use IDE 4.6.0 (april).  Setup to use 6.3.2 tools. I notice the debugger has problem identifing threads in the core file.
  I try updating too 6.8.u1 by copying the executable over the 6.3.2 file.

When launch the debug session I get a "Problem Occured" dialog with the following message:

Error creating session
Cannot access memory at address 0x8bd231e5
  Cannot access memory at address 0x8bd231e5
  Cannot access memory at address 0x8bd231e5

And the session terminates.

I manually launch gdb from outside the IDE and do see the error message come once but it's usable.