SDK crashing for no apparent reason

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FNG / Fresh Meat
Sep 5, 2010
I can't get the KF SDK to run. It gives the following error..

Build UT2004_Build_[2004-11-11_10.48]

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD Unknown processor @ 2207 MHz with 2046MB RAM
Video: Radeon X1300/X1550 Series   (6925)

Assertion failed: WhiteCircle [File:.\UnTerrainTools.cpp] [Line: 788]

History: FTerrainTools::Init
Occurs when I try to start KFEd.exe with or without steam. Reinstalled the SDK multiple times, restarted my computer, restored the original KillingFloor.ini, etc.

A couple days ago I launched it to view some source files, and decompile a mutator, then closed it. A few minutes later when I tried to open it again, it gave that error. Retrying and all the obvious fixes that came to mind didn't do anything.

HOWEVER: It does change slightly.. it reads my processor at varying speeds, including -42 (yes, that's negative 42) and 4000+. The actual error remains the same every time. Any ideas?