some more callstack info : (seems crash is at shutdown of cb) :
#0 6CE7A909 wxmsw28u_gcc_cb!_ZNK11wxSizerItem7IsShownEv() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#1 6CE7E7A8 wxmsw28u_gcc_cb!_ZN10wxBoxSizer7CalcMinEv() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#2 6CE7B802 wxmsw28u_gcc_cb!_ZN7wxSizer6LayoutEv() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#3 6193836B wxFlatNotebook::SetSelection(this=0x16cf0a0, page=2) (C:/Projects/CodeBlocks/src/sdk/wxFlatNotebook/src/wxFlatNotebook/wxFlatNotebook.cpp:293)
#4 6193E1DF wxPageContainer::DoDeletePage(this=0x16a8d80, page=3) (C:/Projects/CodeBlocks/src/sdk/wxFlatNotebook/src/wxFlatNotebook/wxFlatNotebook.cpp:1274)
#5 61939232 wxFlatNotebook::RemovePage(this=0x16cf0a0, page=3, notify=true) (C:/Projects/CodeBlocks/src/sdk/wxFlatNotebook/src/wxFlatNotebook/wxFlatNotebook.cpp:554)
#6 6188ABE7 MessageManager::RemoveLog(this=0x16a3be8, log=0x3e31f90) (C:/Projects/CodeBlocks/src/sdk/messagemanager.cpp:354)
#7 64B9EF33 CompilerGCC::OnRelease(this=0x21b0ca0, appShutDown=true) (C:/Projects/CodeBlocks/src/plugins/compilergcc/compilergcc.cpp:413)
#8 617DED50 cbPlugin::Release(this=0x21b0ca0, appShutDown=true) (C:/Projects/CodeBlocks/src/sdk/cbplugin.cpp:81)
#9 61898124 PluginManager::DetachPlugin(this=0x2024af0, plugin=0x21b0ca0) (C:/Projects/CodeBlocks/src/sdk/pluginmanager.cpp:216)
#10 618A11AB PluginManager::UnloadPlugin(this=0x2024af0, plugin=0x21b0ca0) (C:/Projects/CodeBlocks/src/sdk/pluginmanager.cpp:1154)
#11 618A116E PluginManager::UnloadAllPlugins(this=0x2024af0) (C:/Projects/CodeBlocks/src/sdk/pluginmanager.cpp:1142)
#12 61897F1A PluginManager::~PluginManager(this=0x2024af0) (C:/Projects/CodeBlocks/src/sdk/pluginmanager.cpp:187)
#13 619C25EC Mgr<PluginManager>::Free() (C:/Projects/CodeBlocks/src/include/manager.h:187)
#14 61883B8E Manager::Shutdown() (C:/Projects/CodeBlocks/src/sdk/manager.cpp:166)
#15 00439E0C MainFrame::OnApplicationClose(this=0x16539c0, event=@0x22ed94) (C:/Projects/CodeBlocks/src/src/main.cpp:2553)
#16 6CD07305 wxmsw28u_gcc_cb!_ZN12wxEvtHandler21ProcessEventIfMatchesERK21wxEventTableEntryBasePS_R7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#17 6CD0765C wxmsw28u_gcc_cb!_ZN16wxEventHashTable11HandleEventER7wxEventP12wxEvtHandler() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#18 6CD08629 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#19 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#20 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#21 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#22 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#23 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#24 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#25 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#26 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#27 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#28 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
#29 6CD085C9 wxmsw28u_gcc_cb!_ZN12wxEvtHandler12ProcessEventER7wxEvent() (C:\Projects\CodeBlocks\src\devel\wxmsw28u_gcc_cb.dll:??)
EDIT : and thje crash is in the message panes, which look weird, line seems doubled, just like you would split screen an editor