Tyler Stout

@Liviu
I tested these same commands in 1.8.8, and it seemed to work fine.

@Searge
The commands I used are as follows:
/scoreboard objectives add sneak
And a few other commands dealing with the "sneak" objective, as seen in this video: https://youtu.be/jyWzHhIOWQ8
/execute @p[score_sneak_min=1] ~ ~ ~ execute @e[name=Bridge,r=5] ~ ~ ~ scoreboard players operation Bridge sneak = @p sneak
And the command with the error:
/execute @p[score_sneak=0] ~ ~ ~ execute @e[name=Bridge,r=5,score_sneak_min=5] ~ ~ ~ setblock ~1 ~2 ~ minecraft:planks

For an easier demonstration, I also set up an armor stand with the name Bridge with a sneak score of 10, stood within five blocks, and tested the second execute entity tags in a testfor command, and yet received no output. After eliminating the "name=Bridge" and "r=5," I found that the problem was only in the score_sneak_min=5 tag.
/testfor @e[type=ArmorStand,score_sneak_min=5]

I suppose it is possible that the bug is only within the "sneak" objective or only applies to armor stands

I'm having the same problem. I've been using /execute @p ~ ~ ~ testforblock ~ ~-1 ~ stained_glass_pane 1, and the command fails to execute. The testforblock command will check for data values of wood, clay, glass, etc., but when used with /execute, it will not work.

I just needed to download the 64-bit Java as well.

Never mind, I got it working now. Thank you!

I updated Java, but the game is still crashing