[Platform glitch?]

My technic platform downloads the modpack finishes without errors then when I click launch again it starts downloading again. I am using the latest stable build (#293) and using a custom modpack... I have tried with every other default modpacks and the same happens

Edit: I have tried on multiple computers and even a friend tried but nothing worked :\

[Pump Crash]

When right clicking (or use item) on a pump (Under Basic Pipes) the game crashes I have tried on a server and client. this is happening in Voltz version 1.0.5

[The Sand Bug]

Ok after getting the latest build of Technic pack ( version 7.2.6 )

After staring a survival world i spawned in a desert so naturally i got some sand.

but right after getting sand it dissapeared!

so after some frustration i decided to turn on NEI and cheat in some sand and 1 by 1 the stack of sand in my inventory dissapeared in about 20 seconds

what should i do?