Well, I don't know if I can switch the java version since it is remote hosted from a website...If you are running on Java 8 or on Minecraft 1.8 there could be issues. Java 8 brought changes to the language which may make the code I use incompatible, and Minecraft 1.8 has several bugs when it comes to fallingblocks
Try running Minecraft 1.7.10 on Java 7 and you should be fine. Let me know if you are still experiencing difficulties.