please do the following;
1:add any mesh.
2:add new material
3:hit vcol button
4:click other buttons(any in materials window) double click seems to be worst
5: watch the vcol light button
it selects itself.
i’ve repeated this several times in 2.37 & 2.37a. doesnt happen in 2.36.
reporting now. anyone else care to try to confirm it?
This only happens when I select The raytransp or Raymir buttons.
tried to report it but i’m having trouble logging in at blender.org.
Rocketman: yeah they seem to do it everytime first click. but i,ve had it happen with shadowless and others. guess a confirmed bug?
somebody able to report it? as i said login trouble. my 56k aint great. could be it.
I submitted it. 
See it here:
http://projects.blender.org/tracker/index.php?func=detail&aid=2762&group_id=9&atid=125
thanks lemmy. its really bothering me. i use vcol alot.