I'm experiencing the same issue, I'm using Windows 8.1 though.
Yes Tails, I just checked and the borders disappear on Far and Normal, but persists on Short and Tiny. That's so odd.
I'm sorry Tails, but I don't see any lines between solid blocks as MC-1794 does. The problem here only happens with grass, glass, cactus spikes and other non full blocks as well. I see white borders around these blocks that disappear when I'm typing or using the F1 mode.
This is really annoying. I tried to turn on redstone lights using a redstone block and sticky piston powered by detector rails, but it didn't retracted. Same bug.
My crash report, also having the same problem
Still affecting 14w33a.
I wonder If I should create a new issue, my environment is different (Java 8 and windows 8.1 64bits) and I've identified the game only crashes when VBO is turned on.
Edit: I guess my system doesn't support VBO, oh well.