Hmmm, OK : thanks Jens... So, a more general subsequent question : is there a way to reset all perspectives to the factory ones (the one as they are when C::B is installed for the first time) ? Also, not clear for me when a perspective is auto-applied : where do you decide that it's this specific perspective when you run a debug session against GDB, for example ?
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EDIT : just to close the thread properly : I've finally resetted the toolbar disabling the plugin, then re-enabling-it. Also, the toolbar was gone (I think) because the down arrow of right combo-box was outside of screen (in this state, the tool is perfectly usable, and I didn't noticed)... So, at next C::B launching, the toolbar had maybe some difficulties to retrieve this special position (because of this right side coordinate).