When a user selects a WindowBlinds theme, all other users will be flipped from the default XP scheme to 'Windows Classic' the next time they log in.  This can be rectified by the user selecting a theme (or the default XP scheme if they wish), but this crosstalk should not be happening.
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WindowBlinds 5.0 System Information Report:
STATUS : WB+ SRV+ HLP+ UI+ TRAY+ 
WindowBlinds is installed correctly on this PC.
WindowBlinds appears to be activated on this PC
Your machine supports per pixel borders on WindowBlinds skins.
You have one monitor in total.
(L768) 1 is attached to RADEON X800 PRO/GTO
Wblind.dll     	2006/07/28 18:29:04
Wbsrv.dll     	2006/07/14 17:22:54
Wbconfig.exe     	2006/07/13 18:37:40
Wbload.exe     	2006/03/13 16:54:12
Wbhelp.dll     	2004/09/18 16:37:00
Wbui.dll     	2005/12/06 20:29:06
Tray.dll     	2006/04/13 17:29