This is due to the wxSTAY_ON_TOP flag in the new splash screen class.
I told you, I told you, I told you... we already had this bug once.
When the "select default compiler" dialog tries to show up, the wxSTAY_ON_TOP flag prevents it from doing so ---> app freezes.
It's fixed in SVN.
Update();
#if defined(__WXMSW__) || defined(__WXMAC__)
Update();
#else
wxYieldIfNeeded();
#endif
BTW, could you make this little changeDid that (does of course not solve the problem).