My name is Stephen Davey and I work with John Moule at Somnium Technologies. I understand you have already had some contact with John recently.
I'm reporting a bug related to the GNU ARM plugins for Eclipse Kepler. It concerns pressing the Debug icon from within the C/C++ Debug perspective. Now if there is a GNU ARM based project selected in the Project Explorer (see attached screenshot - project_selected.png) then instead of the last debug launch being launched, the 'Launch Debug Configuration Selection' dialog is opened (see screenshot - launch_debug.png).
Pressing the same debug icon , but without a project being selected under the Project Explorer (after closing and reopening the Project Explorer) or when selected a resource from within a project under the Project Explorer, then the last debug is launched, as expected.
Pressing the debug icon from within the Debug perspective also behaves as expected - the last debug is launched.
I hope this is sufficient to help you reproduce the behaviour. However, let me know if anything is not clear.