I had EXACTLY the same issue in Windows 7 64-bit (All updates done to October 2017). MO would crash upon exit, downloading from Nexus whether closed or open. Would display crash message upon EVERY Nexus download, but not close MO itself. Didn't seem to affect the stability of the game once it was going, and downloads would complete. It's a crash caused by Qt5Gui.dll. I CAN CONFIRM that running the app in Compatibility Mode for Windows 7, however bizarre, seems to fix it. It didn't always crash so I can only assume some prerequisite that another game on Steam/Origin has installed has caused it, or a Windows update. To be safe I reinstalled Visual C++ Runtime 2013 both 32 and 64 bit but made no difference. Also reinstalling Mod Organizer itself made no difference. Here's the Windows Event Viewer Log: Faulting application name: ModOrganizer.exe, version: 1.3.11.0, time stamp: 0x55eaff0b Faulting module name: Qt5Gui.dll, version: 5.4.1.0, time stamp: 0x5554efe6Exception code: 0xc0000005Fault offset: 0x0001e8deFaulting process id: 0x87cFaulting application start time: 0x01d341fbe2025220Faulting application path: C:\Program Files (x86)\Mod Organizer\ModOrganizer.exeFaulting module path: C:\Program Files (x86)\Mod Organizer\dlls\Qt5Gui.dllReport Id: 2258afe0-adef-11e7-9220-010101010000 Hardware Specs:ASUS Strix Z270F MotherboardCore i7 7700k @ 4.2GHz (Not Overclocked)32GB Corsair 3200MHz RAMGigabyte Aorus GTX 1080 Ti w/ 11GB GDDR5512GB Samsung Evo Pro SSD (MO and Skyrim on the SSD)3 TB Mechanical HDDWindows 7 Ultimate 64-bitClamwin / No Active Antivirus (W7 only for gaming) Hope this helps,Unlikely we'll get to the bottom of it now, but the workaround you discovered works great so :-).More an annoyance than anything...Cheers,David