Mekanism has issues with some blocks. For example

Ultimate mechanical pipe

Creative Tab

Pls Help!

Mekanism ver: 10.0.9.432
Forge ver: 32.0.108 (Latest)

2 things:

1. check if someone else had the same problem before submitting
2. Unistall Optfine, is the cause of it

P.S. Don't delete and follow the format when you submit a issue next time

i think optifine is the cause (issue #6466)

let me try

ok optifine is the issue. Thanks!