I have fancy graphics set to on. As of build 10 I am noticing these black lines in jungle leaves where transparency is expected to be seen. I understand that you weren't originally able to see threw jungle leaves. Now the leaves texture appear to have been updated and instead of seeing transparency, black lines display threw the block where the transparency is expected to been seen. See photo attached. ALSO the jungle leaves block I am holding does not match the new jungle leaves texture.
Since 0.9.0, the devs decided to make their leaves (jungle) non-transparent to increase the performance.