Left one is C::B build with wx2.9.5 right one is wx2.8.12 (TRUNK, with MinGW on windows 7 64bit).
As you can see C::B with wx2.9.5 is definitely more beefy.This is most probably wxWidgets issue.
Controls, spacing and Text size is obviously bigger. I just wonder is it like this for everybody else or is it just me?