Hey all, I am having a similar issue using Mod Organizer 1.2.9. I've already tried installing MO to a new location, deleting the nexus_cookies.dat file, as well as changing my NMM version to 0.50.3 in the workarounds tab and so far none have helped. I've also disabled automatic login and logging in on download fails as well. I have disabled the previewDDS.dll - I don't know if this is related or not. Having it enabled causes the ModOrganizer.exe process to kick off (I can see it in the task manager) but the app doesn't make it even into the splash screen. [spoiler=MO Log] 23:51:48 [D] MO at: C:MO_SkyrimMod Organizer23:51:48 [D] managing game at C:Program Files (x86)SteamsteamappscommonSkyrim23:51:48 [D] cleaning up unused files23:51:48 [D] setting up configured executables23:51:48 [D] initializing tutorials23:51:49 [D] interface Ethernet seems to be up (address: FE80::60C8:6779:948B:6A94%4)23:51:51 [D] looking for plugins in C:MO_SkyrimMod Organizerplugins23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/bsaExtractor.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/checkFNIS.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/diagnoseBasic.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/iniEditor.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerBAIN.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerBundle.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerFomod.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerManual.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerNCC.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/installerQuick.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/NMMImport.dll"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/previewBase.dll"23:51:51 [D] plugin "previewDDS.dll" blacklisted23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/pyCfg.py"23:51:51 [D] loaded plugin "C:/MO_Skyrim/Mod Organizer/plugins/proxyPython.dll"23:51:51 [D] configured profile: Default23:51:51 [D] activate profile "Default"23:51:51 [D] C:MO_SkyrimMod OrganizerprofilesDefaultmodlist.txt saved23:51:51 [D] displaying main window23:51:51 [D] starting download from command line: nxm://Skyrim/mods/56980/files/100012195423:51:51 [D] Download started23:51:51 [D] download requested: nxm://Skyrim/mods/56980/files/100012195423:51:52 [D] login failed: Error downloading https://nmm.nexusmods.com/skyrim/sessions/?Login&uri=http%253A%252F%252Fnmm.nexusmods.com%252Fskyrim - server replied: Forbidden. Trying to download anyway 23:51:52 [D] download requested: nxm://Skyrim/mods/56980/files/100012195423:51:52 [D] add nxm download: nxm://Skyrim/mods/56980/files/100012195423:51:52 [D] login failed: Please check your password23:51:52 [W] QCoreApplication::postEvent: Unexpected null receiver23:51:52 [D] file info received for VioLens - A Killmove Mod 1.023:51:57 [D] 1 orphaned meta files will be deleted I am running Windows 8.1 64 bit if that makes a difference. If any other information would be helpful let me know.