I had fixed it in an old install..
when testing with vbulletin beta it is there again.. BUT IT IS NOT an vb3.8 issue!!!!
as the error can be reproduced on chucks site !! - PhotoPost vBGallery
shows the images of user 1 (in this case chuck's images)
as you can see category title in navbits AND on top of images is empty..
(at least for unregged user) It should be: Chuck's Images
grrr.. cant find in my old install where i had fixed it..