It happens while debugging with Delphi 6, using the "XP Charcoal II" skin (Maybe others).
If I put the cursor over the titlebar buttons (Close, Minimize, Maximize)

I get an exception: "Access violation at address 6605CB9D in module 'wblinds.dll'. Read of address BAADF0?D"

Where ? depends on the button (0 for close, 2 for maximize, 4 for minimize and 6 for restore)

The programs runs without a glitch if run outside the debugger (or with another skin).

Obligatory Bits:
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.

(Plug and Play Monitor) 1 is attached to NVIDIA GeForce4 MX 4000

Wblind.dll 2006/06/06 12:09:02
Wbsrv.dll 2006/02/05 12:58:22
Wbconfig.exe 2006/03/19 14:33:44
Wbload.exe 2006/03/13 17:54:12
Wbhelp.dll 2004/09/18 16:37:00
Wbui.dll 2005/12/06 21:29:06
Tray.dll 2005/11/02 13:28:26

Additional Info: Windows XP/SP2, 2GB RAM, plenty of HD, ForceWare 81.98