I've had a problem with WB6.2 that has occurred twice after using Vista-ize(tm) Me! and once just setting menu transparency.
After some amount of reboots, 2-5, the right click menu suddenly starts drawing black on black, but highlighting works correctly so the menus are still usable, if sometimes painful to use.
The only way to fix the issue is to delete the skin and reinstall. This has happened to me with Diamond by Stardock Design and VITREX by Pixel-Z.
I don't know if it is related, but the issues started after I stopped using SD Central and started using Impulse.
Dump on WinXP SP3:
WindowBlinds version : WindowBlinds 6.2 (build 61 x86)
WindowBlinds is installed correctly on this PC
WindowBlinds appears to be activated on this PC
Your machine supports per pixel borders on WindowBlinds skins.
(Plug and Play Monitor) 1 is attached to Mobile Intel(R) 945GM Express Chipset Family
(Plug and Play Monitor) 2 is attached to Mobile Intel(R) 945GM Express Chipset Family
Wblind.dll 2008/07/22 10:10:20
Wbsrv.dll 2008/07/22 10:11:10
Wbconfig.exe 2008/07/22 10:10:32
Wbload.exe 2008/04/28 11:35:14
Wbhelp.dll 2008/04/28 11:35:07
Wbui.dll 2008/04/28 11:35:05
Tray.dll 2008/04/28 11:35:21
Screen.exe 2008/07/22 10:10:09
