Lighting Problems - Possible Bug?

Basically I am finding that when Face 0 of a cube is lit, it creates an x like shadow on the surface, which doesn't match the rest of the walls. Also... once in awhile, even when all the prims and faces are facing the same direction, a prim or two will shine considerably brighter, revealing the seems of a wall.

Picture 1 shows all the problems I am talking about. Every texture is a blank texture, and they are all the same color. I think this might be a bug LL needs to address.

http://img153.imageshack.us/img153/7236/lighting13kl.jpg

Picture 2 focuses more on the X problem regarding lighting Face 0. This may be a problem we have to live with

http://img153.imageshack.us/img153/7184/lighting23us.jpg

Picture 3 just shows how messy it is. All same colors and blank texture. Middle hollow prim is Face 0. Others are all Face 4.

http://img20.imageshack.us/img20/1720/lighting34nj.jpg

Please...tell me this is to be fixed!

I had that happen alot of furniture even before they added the new lights, so I'm gonna say it's not a new bug, the new lights just make it show alot more.

I wound up having to make a few things fullbright even though they really shouldn't be lit like that. It stops that ugly shadow effect from one prim to the next.

SL lighting is vertex-based.