After trying Nightly 8982 on Windows XP for a while, I have abandoned it for 8598 RC2 which I used before. The main issue I have seen with 8982 appears in wxSmith, where single-clicking controls on the RAD tool results in immediate generation of an event handler. This is mostly not what I want, very annoying and makes it very hard to do simple layout changes in wxSmith.
Another issue appears to be unforced focus changes, when the mouse leaves the editor area. Suddenly a random file becomes focused, causing confusion. The older 8598 RC2 does not seem to show these issues. Similarly, the 17. May tarball from Jens Lody (build 9-something, now replaced by 9145) does not show similar problems as the 8982 build on Windows.
PS. I don't build C::B myself on Windows, but rely on the prebuilt nightlies.