I just thought I would report that the Index Visualizer AddOn does not work correctly in 2.6.1, on my Windows XP64 r42722.
Here is how to recreate the error:
Open the default scene and then open User Preferences. (CTRL_ALT-U)
Activate the Index Visualizer AddOn.
Select the Cube and TAB into edit mode.
Yeah, the index visualizer works.
TAB out of edit mode and press CTRL-U (we want the Index Visualizer to always load as part of our default setup).
Now re-launch Blender and TAB into edit mode of the default cube.
Boo hoo, no Index Visualizer is present.
Press CTRL-ALT-U and verify the Index Visualizer is enabled and we see that it is.
The Index Visualizer does not show up if it is saved turned on with User Preferences. I don’t know how else to explain it. Can anyone else verify this…?
Here is a picture of the Index Visualizer not showing up but clearly enabled for operation.