Both version WB 7.09a beta 116 and WB 7.09a beta 117 are corrupting IE toolbar with black parts:
2 examples of what happen on 1 one "old" skin Omega and 1 recent, Organic
(click on the image, then click on "voir la taille réelle to see the real sized image)

WindowBlinds version : WindowBlinds 7.1 (build 87 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.
(Philips 190C (19inch LCD MONITOR 190C7)) 1 is attached to NVIDIA GeForce4 MX 440 with AGP8X
Wblind.dll 2010/04/22 11:20:20
Wbsrv.dll 2010/02/03 16:11:56
SevenConfig.exe 2010/02/15 14:09:57
Wbload.exe 2010/02/02 14:33:18
Wbhelp.dll 2009/02/10 17:28:07
Wbui.dll 2009/02/10 17:28:05
Tray.dll 2009/10/21 16:13:19
Screen.exe 2009/12/03 13:43:26
But trouble is exactly similar on others PC's (with different graphic cards - in all cases with latest drivers avaible) with XP SP3 (french) + IE7
N.B.1: checking (or unchecking) "Enable if you have corrupted titlebar buttons & text backgrounds" in "XP specific" settings has no influence at all
N.B.2: this trouble doesn't exist with WB 7.09 beta 112 or 113
N.B.3: the black parts are going away when mouse goes on it and / or if window is resized
Should be great to fix it because it's a little uggly 