r72117 2 affected: starting taskmgr(taskbar) fails with err:(dll/win32/shell32/shlexec.cpp:1409) failed to get data object cpl-applets also do not open r69926 2 affected: starting taskmgr(taskbar) fails with err:(dll/win32/shell32/shlexec.cpp:1409) failed to get data object cpl-applets also do not open r64833 1 affected: starting taskmgr(taskbar) fails with err:(dll/win32/shell32/shlexec.cpp:1409) failed to get data object cpl-applets do still succeed r61713 1 affected: starting taskmgr(taskbar) already fails with err:exec:shellex_load_object_and_run failed to get data object cpl-applets do still succeed r60587 1 affected: starting taskmgr(taskbar) already fails with err:exec:shellex_load_object_and_run failed to get data object cpl-applets do still succeed r60051 1 affected: starting taskmgr(taskbar) already fails with err:exec:shellex_load_object_and_run failed to get data object cpl-applets do still succeed r59000 1 affected: starting taskmgr(taskbar) already fails with err:exec:shellex_load_object_and_run failed to get data object cpl-applets do still succeed Although there is for sure a turning point somewhere between r64833 to r69926 for cpl-applets it's useless to search for it, because I remember we changed the way how we call our cpl applets somewhere in-between (most likely to ShellExecute?). Since the taskmgr failed even earlier, we would only search the unhiding-rev then imho. Here are the logs again for starting taskmgr via right click taskbar (notice the relocations): r59000 (/srv/buildbot_cmake/full_cmake/build/dll/ntdll/ldr/ldrutils.c:1322) LDR: LdrpMapDll Relocating Image Name C:\ReactOS\System32\DosBlaster.dll (00400000 -> 00DB3000) (/srv/buildbot_cmake/full_cmake/build/dll/ntdll/ldr/ldrutils.c:1361) Overlapping DLL: C:\ReactOS\explorer.exe (/srv/buildbot_cmake/full_cmake/build/dll/ntdll/ldr/ldrutils.c:2335) Image explorer.exe has no exports, but were trying to get procedure ___CPPdebugHook. BaseAddress asked 00400000, got entry BA 00400000 (/srv/buildbot_cmake/full_cmake/build/dll/ntdll/ldr/ldrutils.c:2335) Image explorer.exe has no exports, but were trying to get procedure ___CPPdebugHook. BaseAddress asked 00400000, got entry BA 00400000 err:exec:shellex_load_object_and_run failed to get data object (/srv/buildbot_cmake/full_cmake/build/win32ss/user/ntuser/window.c:2573) err: DestroyWindow Owner out. err:exec:shellex_load_object_and_run failed to get data object r72117 (../dll/ntdll/ldr/ldrutils.c:1304) LDR: LdrpMapDll Relocating Image Name C:\ReactOS\System32\DosBlaster.dll (00400000-004B0000 -> 014C0000) (../dll/ntdll/ldr/ldrutils.c:1343) Overlapping DLL: C:\ReactOS\explorer.exe (../dll/ntdll/ldr/ldrutils.c:2320) Image explorer.exe has no exports, but were trying to get procedure ___CPPdebugHook. BaseAddress asked 0x00400000, got entry BA 0x00400000 (../dll/ntdll/ldr/ldrutils.c:2320) Image explorer.exe has no exports, but were trying to get procedure ___CPPdebugHook. BaseAddress asked 0x00400000, got entry BA 0x00400000 (../dll/win32/kernel32/client/loader.c:384) LoadLibraryExW(C:\ReactOS\System32\DosBlaster.Germa) failing with status c000000f (../dll/win32/kernel32/client/loader.c:384) LoadLibraryExW(C:\ReactOS\System32\DosBlaster.Ge) failing with status c000000f err:(../dll/win32/shell32/shlexec.cpp:1403) failed to get data object