wxTreeCtrl became buggy in the newest trunk release

[H]

I do not know exactly when wxTreeCtrl became buggy but at the moment 
wxTreeCtrl and wxTreeBook (using the wxTreeCtrl) seem to be broken. I 
downloaded the latest trunk version and compiled it with the following 
options under Mac OSX

../configure --with-mac --enable-debug --enable-unicode 
--disable-universal --disable-monolithic --enable-gui --disable-shared 
--enable-exceptions --without-odbc --with-opengl

I also compiled the tree control sample and then the following happens:
by clicking and expanding randomly items it seems to be that the 
background colour of selected items is changing from blue to light blue 
and finally to white and back (also in some kind of random order). I do 
not know whether this is a typical Mac bug or if it can be seen on other 
platforms as well.

Any ideas what happened?

Hartwig