# Mathematica sporadically crashes on open

Sometimes, when I open Mathematica, while the opening splash screen still says "Initializing Kernel Connections", Windows will tell me that "Wolfram Mathematica 9 has stopped working". This will happen every time I try to open Mathematica for a while, but then just as randomly as it started, it will stop, and I'll be able to open Mathematica again with no problems. When it stops working, I'm given the option to Debug it, but all I can tell is that it's a segmentation fault that seems to be caused by dereferencing a null pointer. Interestingly, MathKernel still runs fine even when Mathematica is refusing to launch. Does anyone know how I can start fixing/investigating the cause of this?

Edit:
Version: Mathematica Version 9.0.1.0, Microsoft Windows 64-bit
OS: Windows 8

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You should include more information about the precise version of Mathematica you have and your OS. I had this problem on WinXP with Mma8, on a slow computer. I never fixed it but it was more of an annoyance than a real problem. –  Szabolcs Sep 13 at 4:34
I don't remember if I had any messages like initializing kernel connections, but on my MBP (OS X Snow Leopard) from 2009, which is a pretty good laptop, MMA would sometimes freeze and you'd have to force quit it and try to start it again. But sometimes it didn't work for several tries. I concluded then that the splash screen seems to be a lot more demanding than the software itself, but I didn't figure out how to solve it. –  Anon Sep 13 at 7:34
I observe similar behavior with Mma 9.0.1 and Windows 8. For me it seems to occur most with notebooks containing dynamic elements, but I can't consistently reproduce the behavior. –  bobthechemist Sep 14 at 14:54
Same Problem, stuck on Splash screen with $"Initializing \;kernel\; connections..."$ Kernel starts fine by itself. Called Wolfram, they had me try a "clean start" by <kbd>Shift</kbd>+<kbd>Ctrl</kbd>+<kbd>Click</kbd> the Mathematica icon without success, then remove C:\ProgramData\Mathematica and C:Users\x\AppData\Roaming\Mathematica which also did not help. Disabling virus protection as they asked did not help either. Next they asked for a core dump (112 MB) of the front end from the task manager, which I tried to upload to upload.wolfram.com along with a case ID. However the server kept –  sibir Nov 5 at 21:49