For me main surprise was that C::B abandoned default gdb configuration and selected "nix64". It is good feature- manual selection of the actuald debugger-  but when user do it with purpose.  I did not do it, and I`m afraid that there is kind of "slow" corruption of the default.conf  
I`m using  ssbssa gdb from time to time, when update of the gdb in mingw distribution is delayed. It is solid stuff.