Same here, i deleted the wxsmithlib.dll in the output folder and CB starts again (but no wxsmith).
I don't even have a wxsmithlib.dll (fresh svn4599).
It might be that the dll did not get build since some revisions and you deleted an older version that causes the crash.
Since svn4601 wxPropgrid is no longer part of the sdk, but of wxSmith. Until then an older version might have worked without causing an error.
I'm not sure about that, normally I don't use windows (just for testing and on work :?), so I don't know since when wxSmith-dll went away, or if I made something wrong. But I use codeblocks .cbp, and that should work.